diff --git a/source/src/platform.h b/source/src/platform.h
index 7587e1ad..5ea74742 100644
--- a/source/src/platform.h
+++ b/source/src/platform.h
@@ -33,12 +33,14 @@
 #ifdef WIN32
     #define WIN32_LEAN_AND_MEAN
     #include "windows.h"
+    #ifndef _WINDOWS
+      #define _WINDOWS
+    #endif
     #include <tlhelp32.h>
     #ifndef __GNUC__
         #include <Dbghelp.h>
     #endif
     #define ZLIB_DLL
-    #define _WINDOWS
 #endif
 
 #ifndef STANDALONE