diff --git a/dlls/mscms/mscms_priv.h b/dlls/mscms/mscms_priv.h
index c979ea85fef..479148bee80 100644
--- a/dlls/mscms/mscms_priv.h
+++ b/dlls/mscms/mscms_priv.h
@@ -44,6 +44,7 @@
 #undef CopyMemory
 
 #undef LOWORD
+#undef HIWORD
 #undef MAX_PATH
 
 #ifdef HAVE_LCMS_LCMS_H