diff --git a/src/common/int-util.h b/src/common/int-util.h
index dcf28d38a..6207997fe 100644
--- a/src/common/int-util.h
+++ b/src/common/int-util.h
@@ -209,9 +209,9 @@ static inline void memcpy_swap64(void *dst, const void *src, size_t n) {
   }
 }
 
-#if _MSC_VER
-# define LITTLE_ENDIAN	1234
-# define BIG_ENDIAN	4321
+#ifdef _MSC_VER
+# define LITTLE_ENDIAN	1234
+# define BIG_ENDIAN	4321
 # define BYTE_ORDER	LITTLE_ENDIAN
 #endif