diff --git a/Makefile b/Makefile
index 3b204a1..fcb706e 100644
--- a/Makefile
+++ b/Makefile
@@ -101,7 +101,7 @@ release-tag:
 	git tag -s -m 'Release version $(VERSION).' mt-st-$(VERSION)
 
 clean:
-	rm -f *~ \#*\# *.o $(PROGS) version.h
+	rm -f *~ \#*\# *.o *.gcno *.gcda coverage.info $(PROGS) version.h
 	rm -rf out
 
 reindent: