diff --git a/Makefile b/Makefile
index 48f7f43..e98b796 100644
--- a/Makefile
+++ b/Makefile
@@ -14,3 +14,5 @@ test/input: $(TEST_INPUT)
 	$(CC) -Wall $(TEST_INPUT) -o test/input
 .c.o:
 	$(CC) -g -std=c89 -Wall -c $< -o $@
+clean:
+	$(RM) $(TESTS) $(OUT) *.o