diff --git a/include/osgViewer/api/Win32/GraphicsWindowWin32 b/include/osgViewer/api/Win32/GraphicsWindowWin32
index afcaaee65..548f7f924 100644
--- a/include/osgViewer/api/Win32/GraphicsWindowWin32
+++ b/include/osgViewer/api/Win32/GraphicsWindowWin32
@@ -107,6 +107,7 @@ class OSGVIEWER_EXPORT GraphicsWindowWin32 : public osgViewer::GraphicsWindow, p
         bool registerWindowProcedure();
         bool unregisterWindowProcedure();
         
+        HGLRC createContextImplementation();
         bool createWindow();
         bool setWindow( HWND handle );