diff --git a/include/osg/Export b/include/osg/Export
index 422a7ad00..733b5e0a3 100644
--- a/include/osg/Export
+++ b/include/osg/Export
@@ -30,6 +30,10 @@
     #pragma warning( disable : 4786 )
     #pragma warning( disable : 4305 )
     #pragma warning( disable : 4996 )
+
+
+    // suppress warnings about valid if ((variable=expression)) {} usage.
+    #pragma warning( disable : 4706 )
 #endif
 
 #if defined(_MSC_VER) || defined(__CYGWIN__) || defined(__MINGW32__) || defined( __BCPLUSPLUS__)  || defined( __MWERKS__)