diff --git a/include/osg/Export b/include/osg/Export
index c8b43365f..80c306e1d 100644
--- a/include/osg/Export
+++ b/include/osg/Export
@@ -10,6 +10,7 @@
 	#pragma warning( disable : 4251 )
 	#pragma warning( disable : 4275 )
 	#pragma warning( disable : 4786 )
+    #pragma warning( disable : 4290 )
 #endif
 
 #if defined(_MSC_VER) || defined(__CYGWIN__) || defined(__MINGW32__) || defined( __BCPLUSPLUS__)