diff --git a/public/steam/steamtypes.h b/public/steam/steamtypes.h
index 49653c4a..ac703549 100644
--- a/public/steam/steamtypes.h
+++ b/public/steam/steamtypes.h
@@ -17,7 +17,7 @@ typedef unsigned char uint8;
 	#endif
 #endif
 
-#if defined(__LP64__) || defined(__x86_64__) || defined(_WIN64) || defined(__aarch64__) || defined(__s390x__)
+#if (defined(__LP64__) || defined(__x86_64__) || defined(_WIN64) || defined(__aarch64__) || defined(__s390x__)) && !defined(X64BITS)
 #define X64BITS
 #endif