diff --git a/src/headers/tomcrypt_macros.h b/src/headers/tomcrypt_macros.h
index d87fb4d..85de9e6 100644
--- a/src/headers/tomcrypt_macros.h
+++ b/src/headers/tomcrypt_macros.h
@@ -343,7 +343,7 @@ static inline ulong32 RORc(ulong32 word, const int i)
 
 
 /* 64-bit Rotates */
-#if !defined(__STRICT_ANSI__) && defined(__GNUC__) && defined(__x86_64__) && !defined(LTC_NO_ASM)
+#if !defined(__STRICT_ANSI__) && defined(__GNUC__) && defined(__x86_64__) && !defined(_WIN64) && !defined(LTC_NO_ASM)
 
 static inline ulong64 ROL64(ulong64 word, int i)
 {