diff --git a/src/osgPlugins/directx/types.h b/src/osgPlugins/directx/types.h
index e91716216..c01b7175d 100644
--- a/src/osgPlugins/directx/types.h
+++ b/src/osgPlugins/directx/types.h
@@ -21,8 +21,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
-#ifndef _TYPES_H_
-#define _TYPES_H_
+#ifndef _DX_TYPES_H_
+#define _DX_TYPES_H_
 
 #include <string>
 #include <vector>