diff --git a/components/sdlutil/sdlgraphicswindow.cpp b/components/sdlutil/sdlgraphicswindow.cpp
index 39b479f29..9e7ab5f9b 100644
--- a/components/sdlutil/sdlgraphicswindow.cpp
+++ b/components/sdlutil/sdlgraphicswindow.cpp
@@ -1,6 +1,6 @@
 #include "sdlgraphicswindow.hpp"
 
-#include <osgViewer/viewer>
+#include <osgViewer/Viewer>
 
 #include <SDL_video.h>