diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index bc2a4007a..84bc940b3 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -1029,6 +1029,7 @@ GraphicsWindowWin32::GraphicsWindowWin32( osg::GraphicsContext::Traits* traits )
   _closeWindow(false),
   _destroyWindow(false),
   _destroying(false),
+  _mouseCursor(0),
   _appMouseCursor(LeftArrowCursor),
   _applyWorkaroundForMultimonitorMultithreadNVidiaWin32Issues( false )
 {