diff --git a/tests/suites/test_suite_debug.data b/tests/suites/test_suite_debug.data
index 512a04acab63..2826e8f55d88 100644
--- a/tests/suites/test_suite_debug.data
+++ b/tests/suites/test_suite_debug.data
@@ -1,8 +1,8 @@
 Debug print msg (threshold 1, level 0)
-debug_print_msg_threshold:1:0:"MyFile":999:"MyFile(0999)\: Text message, 2 == 2\n"
+debug_print_msg_threshold:1:0:"MyFile":999:"MyFile(0999)\: Text message, 2 == 2, len=10\n"
 
 Debug print msg (threshold 1, level 1)
-debug_print_msg_threshold:1:1:"MyFile":999:"MyFile(0999)\: Text message, 2 == 2\n"
+debug_print_msg_threshold:1:1:"MyFile":999:"MyFile(0999)\: Text message, 2 == 2, len=10\n"
 
 Debug print msg (threshold 1, level 2)
 debug_print_msg_threshold:1:2:"MyFile":999:""
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index b9610406bb90..beef2862db38 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -57,6 +57,7 @@ void debug_print_msg_threshold(int threshold, int level, char *file,
     mbedtls_ssl_context ssl;
     mbedtls_ssl_config conf;
     struct buffer_data buffer;
+    size_t len = 10;
 
     MD_PSA_INIT();
 
@@ -77,7 +78,7 @@ void debug_print_msg_threshold(int threshold, int level, char *file,
     mbedtls_debug_set_threshold(threshold);
 
     mbedtls_debug_print_msg(&ssl, level, file, line,
-                            "Text message, 2 == %d", 2);
+        "Text message, 2 == %d, len=%" MBEDTLS_PRINTF_SIZET, 2, len);
 
     TEST_ASSERT(strcmp(buffer.buf, result_str) == 0);