diff --git a/Utilities/types.h b/Utilities/types.h
index 72ddb37a63..8e21c8d73b 100644
--- a/Utilities/types.h
+++ b/Utilities/types.h
@@ -18,7 +18,7 @@
 #include <array>
 
 #ifdef _MSC_VER
-#ifndef __cpp_lib_bitops && _MSC_VER < 1928
+#if !defined(__cpp_lib_bitops) && _MSC_VER < 1928
 #define __cpp_lib_bitops
 #endif
 #endif