diff --git a/scat/GNUmakefile b/scat/GNUmakefile
index 704e3d2..5c13937 100644
--- a/scat/GNUmakefile
+++ b/scat/GNUmakefile
@@ -13,6 +13,9 @@ scat.h: scat.en.msg
 clean:
 	rm -f *.cat *.o scat core scat.h
 
+distclean: clean
+	rm -f GNUmakerules GNUmakevars
+
 install: $(BINDIR)/scat
 
 GNUmakevars: GNUmakevars.sh