diff --git a/src/GvimExt/Make_ming.mak b/src/GvimExt/Make_ming.mak
index f7265e9..3d94743 100644
--- a/src/GvimExt/Make_ming.mak
+++ b/src/GvimExt/Make_ming.mak
@@ -33,7 +33,7 @@
 endif
 endif
 CXX := $(CROSS_COMPILE)g++
-WINDRES := $(CROSS_COMPILE)windres --preprocessor="$(CXX) -E -xc" -
+WINDRES := $(CROSS_COMPILE)windres --preprocessor="$(CXX) -E -xc" -DRC_INVOKED
 LIBS :=  -luuid
 RES  := gvimext.res
 DEFFILE = gvimext_ming.def