diff --git a/src/video/windx5/directx.h b/src/video/windx5/directx.h
index 12d78e787..0debe73b8 100644
--- a/src/video/windx5/directx.h
+++ b/src/video/windx5/directx.h
@@ -1,5 +1,5 @@
 
-#ifndef _directx_h_
+#ifndef _directx_h
 #define _directx_h
 
 /* Include all of the DirectX 5.0 headers and adds any necessary tweaks */