diff --git a/src/osgViewer/GraphicsWindowX11.cpp b/src/osgViewer/GraphicsWindowX11.cpp
index 27e76afaa..d62d7bdab 100644
--- a/src/osgViewer/GraphicsWindowX11.cpp
+++ b/src/osgViewer/GraphicsWindowX11.cpp
@@ -26,7 +26,6 @@
 
 #include <X11/Xmd.h>
 #include <X11/keysym.h>
-#include <X11/Xmu/WinUtil.h>
 #include <X11/cursorfont.h>
 #include <X11/Intrinsic.h>