diff --git a/Makefile b/Makefile
index ec8a61c..2d35eb5 100644
--- a/Makefile
+++ b/Makefile
@@ -62,4 +62,4 @@ clean :
 	-rm -f $(targets)
 
 distclean : clean
-	-rm -rf sunterlib-$(version) sunterlib-$(version).tar.gz
+	-rm -rf sunterlib-$(version) sunterlib-$(version).tar.gz sunterlib-$(version).tar.gz.sig