diff --git a/Makefile.in b/Makefile.in
index 9b15666..61c00f3 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -22,7 +22,7 @@ all: build
 build: ${PROG}
 
 clean:
-	rm *.o
+	rm *.o *.og *.gcda *.gcno *.gcov
 	rm $(PROG)
 
 install: