diff --git a/src/osgViewer/GraphicsWindowWin32.cpp b/src/osgViewer/GraphicsWindowWin32.cpp
index 601e96b5c..7bf55c5f6 100644
--- a/src/osgViewer/GraphicsWindowWin32.cpp
+++ b/src/osgViewer/GraphicsWindowWin32.cpp
@@ -846,7 +846,7 @@ bool Win32WindowingSystem::changeScreenSettings( const osg::GraphicsContext::Scr
     // Start by testing if the change would be successful (without applying it)
     //
 
-    int result = ::ChangeDisplaySettingsEx(displayDevice.DeviceName, &deviceMode, NULL, CDS_TEST, NULL);
+    LONG result = ::ChangeDisplaySettingsEx(displayDevice.DeviceName, &deviceMode, NULL, CDS_TEST, NULL);
     if (result==DISP_CHANGE_SUCCESSFUL)
     {
         result = ::ChangeDisplaySettingsEx(displayDevice.DeviceName, &deviceMode, NULL, 0, NULL);