diff --git a/Library/ENV/4.3/cc b/Library/ENV/4.3/cc
index cfe8490aab..d13e387c66 100755
--- a/Library/ENV/4.3/cc
+++ b/Library/ENV/4.3/cc
@@ -132,7 +132,7 @@ class Cmd
         # clang doesn't support OpenMP
         args << arg if not tool =~ /^clang/
       when /^-W.*/
-        args << arg if arg =~ /^-W[alp],/
+        args << arg if arg =~ /^-W[alp],/ or arg =~ /^-Wno-/
       when '-macosx_version_min', '-dylib_install_name'
         args << "-Wl,#{arg},#{whittler.next}"
       when /^-isysroot/