diff --git a/lang/m2/m2mm/proto.make b/lang/m2/m2mm/proto.make
index 8596dd11b..e4655ff02 100644
--- a/lang/m2/m2mm/proto.make
+++ b/lang/m2/m2mm/proto.make
@@ -58,7 +58,7 @@ pr:
 lint:		make.main
 		make -f make.main lint
 
-Cfiles:		LLfiles $(GEN_C) $(GEN_H)
+Cfiles:		LLfiles $(GEN_C) $(GEN_H) Makefile
 		echo $(CFILES) | tr ' ' '\012' > Cfiles
 		echo $(HFILES) | tr ' ' '\012' >> Cfiles