diff --git a/src/H5win32defs.h b/src/H5win32defs.h
index 05d291ec03b..a996f60ab01 100644
--- a/src/H5win32defs.h
+++ b/src/H5win32defs.h
@@ -57,7 +57,7 @@ struct timezone {
  * MinGW and the newer, conforming MSVC preprocessor do not exhibit this
  * behavior.
  */
-#if (defined(_MSC_VER) && !defined(_MSVC_TRADITIONAL)) || _MSVC_TRADITIONAL
+#if (defined(_MSC_VER) && !defined(_MSVC_TRADITIONAL)) || defined(_MSVC_TRADITIONAL)
 /* Using the MSVC traditional preprocessor */
 #define HDopen(S, F, ...) Wopen(S, F, __VA_ARGS__)
 #else