diff --git a/base_c/include/embb/base/c/internal/atomic/atomic_sizes.h.in b/base_c/include/embb/base/c/internal/atomic/atomic_sizes.h.in
index b44d1f3..9d09220 100644
--- a/base_c/include/embb/base/c/internal/atomic/atomic_sizes.h.in
+++ b/base_c/include/embb/base/c/internal/atomic/atomic_sizes.h.in
@@ -56,7 +56,7 @@ typedef uint64_t EMBB_BASE_BASIC_TYPE_SIZE_8;
 #define EMBB_UINTMAX_T_TYPE_SIZE ${EMBB_UINTMAX_T_TYPE_SIZE}
 
 
-#ifdef EMBB_ARCH_X86_64
+#ifdef EMBB_PLATFORM_ARCH_X86_64
 #  define EMBB_64_BIT_ATOMIC_AVAILABLE_VAL 1
 #  define EMBB_64_BIT_ATOMIC_AVAILABLE
 #else