1 files changed, 1 insertions, 0 deletions
diff --git a/bin/update_pch b/bin/update_pch
index 47c2d15a4644..a21b0692b6d1 100755
--- a/bin/update_pch
+++ b/bin/update_pch
@@ -762,6 +762,7 @@ def generate(includes, libname, filename, module):
 // Cleanup windows header macro pollution.
 #ifdef WNT
 #   include <postwin.h>
+#   undef RGB
 #endif
 """
             f.write(ado_define)