diff --git a/public/tier0/platform.h b/public/tier0/platform.h
index 338114940..33362f540 100644
--- a/public/tier0/platform.h
+++ b/public/tier0/platform.h
@@ -766,9 +766,11 @@ inline T DWordSwapAsm( T dw )
 // The typically used methods.
 //-------------------------------------
 
-#if defined(__i386__) && !defined LITTLE_ENDIAN
+#if !defined LITTLE_ENDIAN
+#if defined(__i386__) || defined(_M_IX86) || defined(_M_X64)
 #define LITTLE_ENDIAN 1
 #endif
+#endif
 
 #if (defined( _SGI_SOURCE ) || defined( _X360 )) && !defined BIG_ENDIAN
 #define	BIG_ENDIAN 1