diff --git a/CMakeLists.txt b/CMakeLists.txt
index 16afd2cbd..6d51f7f63 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -535,7 +535,7 @@ ELSE(CMAKE_COMPILER_IS_GNUCXX)
         # FIXME: What are good aggressive warning flags for Visual Studio?
         # And do we need to further subcase this for different versions of VS?
         # CMake variables: MSVC60, MSVC70, MSVC71, MSVC80, CMAKE_COMPILER_2005
-        SET(OSG_AGGRESSIVE_WARNING_FLAGS /W4 /wd4706 /wd4127)
+        SET(OSG_AGGRESSIVE_WARNING_FLAGS /W4 /wd4706 /wd4127 /wd4100)
 
 
     ELSE(MSVC)