diff --git a/src/headers/tomcrypt_cfg.h b/src/headers/tomcrypt_cfg.h
index 82be01b..8b06b14 100644
--- a/src/headers/tomcrypt_cfg.h
+++ b/src/headers/tomcrypt_cfg.h
@@ -82,14 +82,6 @@ LTC_EXPORT int   LTC_CALL XSTRCMP(const char *s1, const char *s2);
    #define LTC_FAST
 #endif
 
-#ifdef LTC_FAST
-#if __GNUC__ < 4 /* if the compiler does not support gnu extensions, i.e. its neither clang nor gcc */
-#error the LTC_FAST hack is only available on compilers that support __attribute__((may_alias)) - disable it for your compiler, and dont worry, it won`t buy you much anyway
-#else
-typedef unsigned int __attribute__((__may_alias__)) LTC_FAST_TYPE;
-#endif
-#endif /* LTC_FAST */
-
 /* fix for MSVC ...evil! */
 #ifdef _MSC_VER
    #define CONST64(n) n ## ui64
@@ -108,6 +100,18 @@ typedef unsigned int __attribute__((__may_alias__)) LTC_FAST_TYPE;
    typedef unsigned long ulong32;
 #endif
 
+#ifdef LTC_FAST
+#if __GNUC__ < 4 /* if the compiler does not support gnu extensions, i.e. its neither clang nor gcc */
+#error the LTC_FAST hack is only available on compilers that support __attribute__((may_alias)) - disable it for your compiler, and dont worry, it won`t buy you much anyway
+#else
+#ifdef ENDIAN_64BITWORD
+typedef ulong64 __attribute__((__may_alias__)) LTC_FAST_TYPE;
+#else
+typedef ulong32 __attribute__((__may_alias__)) LTC_FAST_TYPE;
+#endif
+#endif
+#endif /* LTC_FAST */
+
 /* detect sparc and sparc64 */
 #if defined(__sparc__)
   #define ENDIAN_BIG