diff --git a/.gitignore b/.gitignore
index 6e7db3614..4642caf33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,3 +30,10 @@ console/bx
 /release/bx
 /release/bx.exe
 *.zpl
+
+build-libbitcoin-explorer
+libbitcoin_explorer_test_runner.sh.log
+libbitcoin_explorer_test_runner.sh.trs
+test-suite.log
+test.log
+test/libbitcoin_explorer_test
diff --git a/include/bitcoin/explorer/commands/electrum-new.hpp b/include/bitcoin/explorer/commands/electrum-new.hpp
index d7b7da227..7268f915f 100644
--- a/include/bitcoin/explorer/commands/electrum-new.hpp
+++ b/include/bitcoin/explorer/commands/electrum-new.hpp
@@ -58,8 +58,10 @@ namespace commands {
 /**
  * Various localizable strings.
  */
-#define BX_EC_ELECTRUM_NEW_UNSUPPORTED \
-    "The electrum-new command requires an ICU build."
+#define BX_ELECTRUM_NEW_INVALID_SEED \
+    "The seed size is not supported."
+#define BX_ELECTRUM_REQUIRES_ICU \
+    "The command requires an ICU build."
 
 /**
  * Class to implement the electrum-new command.
diff --git a/include/bitcoin/explorer/commands/electrum-to-seed.hpp b/include/bitcoin/explorer/commands/electrum-to-seed.hpp
index 9836cc10e..85ffd08f3 100644
--- a/include/bitcoin/explorer/commands/electrum-to-seed.hpp
+++ b/include/bitcoin/explorer/commands/electrum-to-seed.hpp
@@ -58,7 +58,7 @@ namespace commands {
 /**
  * Various localizable strings.
  */
-#define BX_EC_ELECTRUM_TO_SEED_PASSPHRASE_UNSUPPORTED \
+#define BX_ELECTRUM_TO_SEED_REQUIRES_ICU \
     "The passphrase option requires an ICU build."
 
 /**
diff --git a/include/bitcoin/explorer/commands/mnemonic-decode.hpp b/include/bitcoin/explorer/commands/mnemonic-decode.hpp
index 3ff5e2220..8e373001b 100644
--- a/include/bitcoin/explorer/commands/mnemonic-decode.hpp
+++ b/include/bitcoin/explorer/commands/mnemonic-decode.hpp
@@ -59,7 +59,7 @@ namespace commands {
  * Various localizable strings.
  */
 #define BX_MNEMONIC_DECODE_OBSOLETE \
-    "Electrum style key functions are obsolete. Use mnemonic-to-seed (BIP39) command instead."
+    "Electrum version 1 functions are obsolete. Use electrum-to-seed or mnemonic-to-seed (BIP39) command instead."
 
 /**
  * Class to implement the mnemonic-decode command.
diff --git a/include/bitcoin/explorer/commands/mnemonic-encode.hpp b/include/bitcoin/explorer/commands/mnemonic-encode.hpp
index c061cfd0d..806d975eb 100644
--- a/include/bitcoin/explorer/commands/mnemonic-encode.hpp
+++ b/include/bitcoin/explorer/commands/mnemonic-encode.hpp
@@ -59,7 +59,7 @@ namespace commands {
  * Various localizable strings.
  */
 #define BX_MNEMONIC_ENCODE_OBSOLETE \
-    "Electrum style key functions are obsolete. Use mnemonic-new (BIP39) command instead."
+    "Electrum version 1 functions are obsolete. Use electrum-new or mnemonic-new (BIP39) command instead."
 
 /**
  * Class to implement the mnemonic-encode command.
diff --git a/include/bitcoin/explorer/commands/mnemonic-new.hpp b/include/bitcoin/explorer/commands/mnemonic-new.hpp
index 88e517ff8..d4646e8b1 100644
--- a/include/bitcoin/explorer/commands/mnemonic-new.hpp
+++ b/include/bitcoin/explorer/commands/mnemonic-new.hpp
@@ -58,7 +58,7 @@ namespace commands {
 /**
  * Various localizable strings.
  */
-#define BX_EC_MNEMONIC_NEW_INVALID_ENTROPY \
+#define BX_EC_MNEMONIC_NEW_INVALID_SEED \
     "The seed length in bytes is not evenly divisible by 32 bits."
 
 /**
diff --git a/include/bitcoin/explorer/commands/mnemonic-to-seed.hpp b/include/bitcoin/explorer/commands/mnemonic-to-seed.hpp
index 5eb1abdc4..341518405 100644
--- a/include/bitcoin/explorer/commands/mnemonic-to-seed.hpp
+++ b/include/bitcoin/explorer/commands/mnemonic-to-seed.hpp
@@ -60,7 +60,7 @@ namespace commands {
  */
 #define BX_EC_MNEMONIC_TO_SEED_LENGTH_INVALID_SENTENCE \
     "The number of words must be divisible by 3."
-#define BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED \
+#define BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU \
     "The passphrase option requires an ICU build."
 #define BX_EC_MNEMONIC_TO_SEED_INVALID_IN_LANGUAGE \
     "The specified words are not a valid mnemonic in the specified dictionary."
diff --git a/install.sh b/install.sh
index b4b443a60..d1a4d4f6b 100755
--- a/install.sh
+++ b/install.sh
@@ -279,8 +279,8 @@ fi
 # Set the prefix-based package config directory.
 PREFIX_PKG_CONFIG_DIR="$PREFIX/lib/pkgconfig"
 
-# Augment PKG_CONFIG_PATH search path with our prefix.
-export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$PREFIX_PKG_CONFIG_DIR"
+# Prioritize prefix package config in PKG_CONFIG_PATH search path.
+export PKG_CONFIG_PATH="$PREFIX_PKG_CONFIG_DIR:$PKG_CONFIG_PATH"
 
 # Set a package config save path that can be passed via our builds.
 with_pkgconfigdir="--with-pkgconfigdir=$PREFIX_PKG_CONFIG_DIR"
diff --git a/model/generate.xml b/model/generate.xml
index d4685a63b..7ef8f4d28 100644
--- a/model/generate.xml
+++ b/model/generate.xml
@@ -208,14 +208,15 @@
     <option name="prefix" type="electrum" description="The electrum seed type identifier to use. Options are 'standard', 'witness', and 'dual' (for two factor authentication), defaults to 'standard'." />
     <option name="language" type="language" description="The language identifier of the mnemonic dictionary to use. Options are 'en', 'es', 'pt', 'ja', 'zh_Hans' and 'any', defaults to 'en'." />
     <argument name="SEED" stdin="true" type="base16" description="The Base16 entropy from which the mnemonic is created. If not specified the entropy is read from STDIN." />
-    <define name="BX_EC_ELECTRUM_NEW_UNSUPPORTED" value="The electrum-new command requires an ICU build." />
+    <define name="BX_ELECTRUM_NEW_INVALID_SEED" value="The seed size is not supported." />
+    <define name="BX_ELECTRUM_REQUIRES_ICU" value="The command requires an ICU build." />
   </command>
 
   <command symbol="electrum-to-seed" output="base16" category="WALLET" description="Convert a mnemonic seed (Electrum) to its numeric representation.">
     <option name="language" type="language" description="The language identifier of the dictionary of the mnemonic. Options are 'en', 'es', 'ja', 'pt', 'zh_Hans' and 'any', defaults to 'any'." />
     <option name="passphrase" type="string" description="An optional passphrase for converting the mnemonic to a seed." />
     <argument name="WORD" stdin="true" limit="-1" type="string" description="The set of words that that make up the mnemonic. If not specified the words are read from STDIN." />
-    <define name="BX_EC_ELECTRUM_TO_SEED_PASSPHRASE_UNSUPPORTED" value="The passphrase option requires an ICU build." />
+    <define name="BX_ELECTRUM_TO_SEED_REQUIRES_ICU" value="The passphrase option requires an ICU build." />
   </command>
 
   <command symbol="ek-address" output="payment_address" category="KEY_ENCRYPTION" description="Create a payment address derived from an intermediate passphrase token (BIP38).">
@@ -412,17 +413,17 @@
   </command>
   
   <command symbol="mnemonic-decode" output="base16" category="ELECTRUM" obsolete="true" description="Convert a seed to its Electrum mnemonic.">
-    <define name="BX_MNEMONIC_DECODE_OBSOLETE" value="Electrum style key functions are obsolete. Use mnemonic-to-seed (BIP39) command instead." />
+    <define name="BX_MNEMONIC_DECODE_OBSOLETE" value="Electrum version 1 functions are obsolete. Use electrum-to-seed or mnemonic-to-seed (BIP39) command instead." />
   </command>
   
   <command symbol="mnemonic-encode" formerly="mnemonic" output="string" multipleX="true" category="ELECTRUM" obsolete="true" description="Convert an Electrum mnemonic to its seed.">
-    <define name="BX_MNEMONIC_ENCODE_OBSOLETE" value="Electrum style key functions are obsolete. Use mnemonic-new (BIP39) command instead." />
+    <define name="BX_MNEMONIC_ENCODE_OBSOLETE" value="Electrum version 1 functions are obsolete. Use electrum-new or mnemonic-new (BIP39) command instead." />
   </command>
 
   <command symbol="mnemonic-new" output="string" multipleX="true" category="WALLET" description="Create a mnemonic seed (BIP39) from entropy. WARNING: mnemonic should be created from properly generated entropy.">
     <option name="language" type="language" description="The language identifier of the mnemonic dictionary to use. Options are 'en', 'es', 'fr', 'it', 'ja', 'cs', 'ru', 'uk', 'zh_Hans', 'zh_Hant' and 'any', defaults to 'en'." />
     <argument name="SEED" stdin="true" type="base16" description="The Base16 entropy from which the mnemonic is created. The length must be evenly divisible by 32 bits. If not specified the entropy is read from STDIN." />
-    <define name="BX_EC_MNEMONIC_NEW_INVALID_ENTROPY" value="The seed length in bytes is not evenly divisible by 32 bits." />
+    <define name="BX_EC_MNEMONIC_NEW_INVALID_SEED" value="The seed length in bytes is not evenly divisible by 32 bits." />
   </command>
 
   <command symbol="mnemonic-to-seed" output="base16" category="WALLET" description="Convert a mnemonic seed (BIP39) to its numeric representation.">
@@ -430,7 +431,7 @@
     <option name="passphrase" type="string" description="An optional passphrase for converting the mnemonic to a seed." />
     <argument name="WORD" stdin="true" limit="-1" type="string" description="The set of words that that make up the mnemonic. If not specified the words are read from STDIN." />
     <define name="BX_EC_MNEMONIC_TO_SEED_LENGTH_INVALID_SENTENCE" value="The number of words must be divisible by 3." />
-    <define name="BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED" value="The passphrase option requires an ICU build." />
+    <define name="BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU" value="The passphrase option requires an ICU build." />
     <define name="BX_EC_MNEMONIC_TO_SEED_INVALID_IN_LANGUAGE" value="The specified words are not a valid mnemonic in the specified dictionary." />
     <define name="BX_EC_MNEMONIC_TO_SEED_INVALID_IN_LANGUAGES" value="WARNING: The specified words are not a valid mnemonic in any supported dictionary." />
   </command>
diff --git a/src/commands/electrum-new.cpp b/src/commands/electrum-new.cpp
index 341404505..1f640f92a 100644
--- a/src/commands/electrum-new.cpp
+++ b/src/commands/electrum-new.cpp
@@ -18,9 +18,8 @@
  */
 #include <bitcoin/explorer/commands/electrum-new.hpp>
 
-#include <iostream>
+#include <cmath>
 #include <bitcoin/bitcoin.hpp>
-#include <bitcoin/bitcoin/math/hash.hpp>
 #include <bitcoin/explorer/define.hpp>
 
 namespace libbitcoin {
@@ -28,8 +27,10 @@ namespace explorer {
 namespace commands {
 using namespace bc::wallet;
 
-console_result electrum_new::invoke(std::ostream& output,
-    std::ostream& error)
+// Requires a seed of at least 17 bytes (136 bits).
+static const size_t minimum_electrum_words = 12;
+
+console_result electrum_new::invoke(std::ostream& output, std::ostream& error)
 {
 #ifdef WITH_ICU
     // Bound parameters.
@@ -37,14 +38,30 @@ console_result electrum_new::invoke(std::ostream& output,
     const data_chunk& seed = get_seed_argument();
     const auto prefix = get_prefix_option();
 
+    // trunc(log2(2048)) = 11
+    const auto word_bits = static_cast<size_t>(std::log2(dictionary_size));
+
+    // 17 * 8 = 136
+    const auto seed_bits = seed.size() * byte_bits;
+
+    // 136 / 11 = 12
+    const auto words = seed_bits / word_bits;
+
+    if (words < minimum_electrum_words)
+    {
+        error << BX_ELECTRUM_NEW_INVALID_SEED << std::endl;
+        return console_result::failure;
+    }
+
     // If 'any' default to first ('en'), otherwise the one specified.
     const auto dictionary = language.front();
-    const auto words = electrum::create_mnemonic(seed, *dictionary, prefix);
 
-    output << join(words) << std::endl;
+    auto mnemonic = electrum::create_mnemonic(seed, *dictionary, prefix);
+
+    output << join(mnemonic) << std::endl;
     return console_result::okay;
 #else
-    error << BX_EC_ELECTRUM_NEW_UNSUPPORTED << std::endl;
+    error << BX_ELECTRUM_REQUIRES_ICU << std::endl;
     return console_result::failure;
 #endif
 }
diff --git a/src/commands/electrum-to-seed.cpp b/src/commands/electrum-to-seed.cpp
index eee82cc05..f068cc1f5 100644
--- a/src/commands/electrum-to-seed.cpp
+++ b/src/commands/electrum-to-seed.cpp
@@ -42,7 +42,7 @@ console_result electrum_to_seed::invoke(std::ostream& output,
     // The passphrase requires ICU normalization.
     if (!passphrase.empty())
     {
-        error << BX_EC_ELECTRUM_TO_SEED_PASSPHRASE_UNSUPPORTED << std::endl;
+        error << BX_ELECTRUM_TO_SEED_REQUIRES_ICU << std::endl;
         return console_result::failure;
     }
 
diff --git a/src/commands/mnemonic-new.cpp b/src/commands/mnemonic-new.cpp
index 723e03d74..e39346fac 100644
--- a/src/commands/mnemonic-new.cpp
+++ b/src/commands/mnemonic-new.cpp
@@ -38,7 +38,7 @@ console_result mnemonic_new::invoke(std::ostream& output,
 
     if ((entropy_size % bc::wallet::mnemonic_seed_multiple) != 0)
     {
-        error << BX_EC_MNEMONIC_NEW_INVALID_ENTROPY << std::endl;
+        error << BX_EC_MNEMONIC_NEW_INVALID_SEED << std::endl;
         return console_result::failure;
     }
 
diff --git a/src/commands/mnemonic-to-seed.cpp b/src/commands/mnemonic-to-seed.cpp
index 88fb02236..d7b40208e 100644
--- a/src/commands/mnemonic-to-seed.cpp
+++ b/src/commands/mnemonic-to-seed.cpp
@@ -62,7 +62,7 @@ console_result mnemonic_to_seed::invoke(std::ostream& output,
 #else
     if (!passphrase.empty())
     {
-        error << BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED << std::endl;
+        error << BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU << std::endl;
         return console_result::failure;
     }
 
diff --git a/src/commands/seed.cpp b/src/commands/seed.cpp
index bd6ec9dea..8a4ca99af 100644
--- a/src/commands/seed.cpp
+++ b/src/commands/seed.cpp
@@ -18,7 +18,6 @@
  */
 #include <bitcoin/explorer/commands/seed.hpp>
 
-#include <iostream>
 #include <bitcoin/bitcoin.hpp>
 #include <bitcoin/explorer/define.hpp>
 #include <bitcoin/explorer/utility.hpp>
diff --git a/test/commands/electrum-new.cpp b/test/commands/electrum-new.cpp
index 876fd28ed..c2f355c52 100644
--- a/test/commands/electrum-new.cpp
+++ b/test/commands/electrum-new.cpp
@@ -34,7 +34,7 @@ BOOST_AUTO_TEST_CASE(electrum_new__invoke__17_bytes__okay_output)
     BX_REQUIRE_OUTPUT("giggle crush argue inflict wear defy combine evolve tiger spatial crumble fury\n");
 }
 
-BOOST_AUTO_TEST_CASE(electrum_new__invoke__dictionary_prefix__okay_output)
+BOOST_AUTO_TEST_CASE(electrum_new__invoke__en_dictionary_prefix__okay_output)
 {
     BX_DECLARE_COMMAND(electrum_new);
     command.set_seed_argument({ "05e669b4270f4e25bce6fc3736170d423c" });
@@ -44,6 +44,16 @@ BOOST_AUTO_TEST_CASE(electrum_new__invoke__dictionary_prefix__okay_output)
     BX_REQUIRE_OUTPUT("giggle crush argue inflict wear defy combine evolve tiger spatial crumble fury\n");
 }
 
+BOOST_AUTO_TEST_CASE(electrum_new__invoke__es_dictionary_prefix__okay_output)
+{
+    BX_DECLARE_COMMAND(electrum_new);
+    command.set_seed_argument({ "05e669b4270f4e25bce6fc3736170d423c" });
+    command.set_language_option({ "es" });
+    command.set_prefix_option({ "standard" });
+    BX_REQUIRE_OKAY(command.invoke(output, error));
+    BX_REQUIRE_OUTPUT("gigante codo ámbar insecto verbo cráter celoso entrar tarjeta sala coco frito\n");
+}
+
 BOOST_AUTO_TEST_CASE(electrum_new__invoke__32_bytes__okay_output)
 {
     BX_DECLARE_COMMAND(electrum_new);
diff --git a/test/commands/mnemonic-new.cpp b/test/commands/mnemonic-new.cpp
index 711056c6d..3d54933df 100644
--- a/test/commands/mnemonic-new.cpp
+++ b/test/commands/mnemonic-new.cpp
@@ -37,7 +37,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_new__invoke__136_bits__failure_error)
     BX_DECLARE_COMMAND(mnemonic_new);
     command.set_seed_argument({ "baadf00dbaadf00dbaadf00dbaadf00dff" });
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_NEW_INVALID_ENTROPY "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_NEW_INVALID_SEED "\n");
 }
 
 BOOST_AUTO_TEST_CASE(mnemonic_new__invoke__128_bits__okay_output)
diff --git a/test/commands/mnemonic-to-seed.cpp b/test/commands/mnemonic-to-seed.cpp
index 0f6870bb4..5b14d2fcb 100644
--- a/test/commands/mnemonic-to-seed.cpp
+++ b/test/commands/mnemonic-to-seed.cpp
@@ -85,7 +85,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__standard__okay_output)
     BX_REQUIRE_OUTPUT("2e8905819b8723fe2c1d161860e5ee1830318dbf49a83bd451cfb8440c28bd6fa457fe1296106559a3c80937a1c1069be3a3a5bd381ee6260e8d9739fce1f607\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -102,7 +102,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase__okay_output
     BX_REQUIRE_OUTPUT("3e52585ea1275472a82fa0dcd84121e742140f64a302eca7c390832ba428c707a7ebf449267ae592c51f1740259226e31520de39fd8f33e08788fd21221c6f4e\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -119,7 +119,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words__o
     BX_REQUIRE_OUTPUT("e72505021b97e15171fe09e996898888579c4196c445d7629762c5b09586e3fb3d68380120b8d8a6ed6f9a73306dab7bf54127f3a610ede2a2d5b4e59916ac73\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -137,7 +137,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_an
     BX_REQUIRE_OUTPUT("e72505021b97e15171fe09e996898888579c4196c445d7629762c5b09586e3fb3d68380120b8d8a6ed6f9a73306dab7bf54127f3a610ede2a2d5b4e59916ac73\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -155,7 +155,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_es
     BX_REQUIRE_OUTPUT("e72505021b97e15171fe09e996898888579c4196c445d7629762c5b09586e3fb3d68380120b8d8a6ed6f9a73306dab7bf54127f3a610ede2a2d5b4e59916ac73\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -173,7 +173,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_an
     BX_REQUIRE_OUTPUT("a92538e2827914d13ead2b426aa45ebd0b16590318e04b6ef78780c8eb803269f08662dd74bc4982e7cbb71f15c71f310168457d570ad5fd89c98a6095bac560\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -191,7 +191,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_fr
     BX_REQUIRE_OUTPUT("a92538e2827914d13ead2b426aa45ebd0b16590318e04b6ef78780c8eb803269f08662dd74bc4982e7cbb71f15c71f310168457d570ad5fd89c98a6095bac560\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -209,7 +209,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_an
     BX_REQUIRE_OUTPUT("b145e13882dc52b64a868ba35c3a95de5f468f2963d9feca9a8b345e3a60ef02af42347f99bc35a72d88bdabe8d63a4f5b61a63d6cd549461b5dd11027b66cf7\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }
 
@@ -227,7 +227,7 @@ BOOST_AUTO_TEST_CASE(mnemonic_to_seed__invoke__non_ascii_passphrase_and_words_it
     BX_REQUIRE_OUTPUT("b145e13882dc52b64a868ba35c3a95de5f468f2963d9feca9a8b345e3a60ef02af42347f99bc35a72d88bdabe8d63a4f5b61a63d6cd549461b5dd11027b66cf7\n");
 #else
     BX_REQUIRE_FAILURE(command.invoke(output, error));
-    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_PASSPHRASE_UNSUPPORTED "\n");
+    BX_REQUIRE_ERROR(BX_EC_MNEMONIC_TO_SEED_REQUIRES_ICU "\n");
 #endif
 }