diff --git a/CMakeLists.txt b/CMakeLists.txt
index c764e6423e6c8..f1dac7b24811a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,9 +115,9 @@ if(SECP256K1_ASM STREQUAL "arm32")
     message(FATAL_ERROR "ARM32 assembly optimization requested but not available.")
   endif()
 elseif(SECP256K1_ASM)
-  include(Check64bitAssembly)
-  check_64bit_assembly()
-  if(HAS_64BIT_ASM)
+  include(CheckX86_64Assembly)
+  check_x86_64_assembly()
+  if(HAVE_X86_64_ASM)
     set(SECP256K1_ASM "x86_64")
     add_compile_definitions(USE_ASM_X86_64=1)
   elseif(SECP256K1_ASM STREQUAL "AUTO")
diff --git a/build-aux/m4/bitcoin_secp.m4 b/build-aux/m4/bitcoin_secp.m4
index 6d46b9e85484f..11adef4f22dd8 100644
--- a/build-aux/m4/bitcoin_secp.m4
+++ b/build-aux/m4/bitcoin_secp.m4
@@ -1,12 +1,12 @@
 dnl escape "$0x" below using the m4 quadrigaph @S|@, and escape it again with a \ for the shell.
-AC_DEFUN([SECP_64BIT_ASM_CHECK],[
+AC_DEFUN([SECP_X86_64_ASM_CHECK],[
 AC_MSG_CHECKING(for x86_64 assembly availability)
 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
   #include <stdint.h>]],[[
   uint64_t a = 11, tmp;
   __asm__ __volatile__("movq \@S|@0x100000000,%1; mulq %%rsi" : "+a"(a) : "S"(tmp) : "cc", "%rdx");
-  ]])],[has_64bit_asm=yes],[has_64bit_asm=no])
-AC_MSG_RESULT([$has_64bit_asm])
+  ]])], [has_x86_64_asm=yes], [has_x86_64_asm=no])
+AC_MSG_RESULT([$has_x86_64_asm])
 ])
 
 AC_DEFUN([SECP_ARM32_ASM_CHECK], [
diff --git a/cmake/Check64bitAssembly.cmake b/cmake/CheckX86_64Assembly.cmake
similarity index 70%
rename from cmake/Check64bitAssembly.cmake
rename to cmake/CheckX86_64Assembly.cmake
index 3f658877651ed..ae82cd476e8be 100644
--- a/cmake/Check64bitAssembly.cmake
+++ b/cmake/CheckX86_64Assembly.cmake
@@ -1,6 +1,6 @@
 include(CheckCSourceCompiles)
 
-function(check_64bit_assembly)
+function(check_x86_64_assembly)
   check_c_source_compiles("
     #include <stdint.h>
 
@@ -9,6 +9,6 @@ function(check_64bit_assembly)
       uint64_t a = 11, tmp;
       __asm__ __volatile__(\"movq $0x100000000,%1; mulq %%rsi\" : \"+a\"(a) : \"S\"(tmp) : \"cc\", \"%rdx\");
     }
-  " HAS_64BIT_ASM)
-  set(HAS_64BIT_ASM ${HAS_64BIT_ASM} PARENT_SCOPE)
+  " HAVE_X86_64_ASM)
+  set(HAVE_X86_64_ASM ${HAVE_X86_64_ASM} PARENT_SCOPE)
 endfunction()
diff --git a/configure.ac b/configure.ac
index c898b9239a947..3db87be16490d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -263,8 +263,8 @@ else
 fi
 
 if test x"$req_asm" = x"auto"; then
-  SECP_64BIT_ASM_CHECK
-  if test x"$has_64bit_asm" = x"yes"; then
+  SECP_X86_64_ASM_CHECK
+  if test x"$has_x86_64_asm" = x"yes"; then
     set_asm=x86_64
   fi
   if test x"$set_asm" = x; then
@@ -274,8 +274,8 @@ else
   set_asm=$req_asm
   case $set_asm in
   x86_64)
-    SECP_64BIT_ASM_CHECK
-    if test x"$has_64bit_asm" != x"yes"; then
+    SECP_X86_64_ASM_CHECK
+    if test x"$has_x86_64_asm" != x"yes"; then
       AC_MSG_ERROR([x86_64 assembly optimization requested but not available])
     fi
     ;;