diff --git a/XML/src/xmltok.c b/XML/src/xmltok.c
index 6c4ca1548..6afaf5c41 100644
--- a/XML/src/xmltok.c
+++ b/XML/src/xmltok.c
@@ -42,7 +42,7 @@
 #  include <stdbool.h>
 #endif
 
-#ifdef _WIN32
+#ifdef EXPAT_WIN32
 #  include "winconfig.h"
 #else
 #  ifdef HAVE_EXPAT_CONFIG_H