diff --git a/cs677/hw1/Makefile b/cs677/hw1/Makefile
index 83ab464..9c5ca4d 100644
--- a/cs677/hw1/Makefile
+++ b/cs677/hw1/Makefile
@@ -6,6 +6,9 @@ all: $(TARGET)
 $(TARGET): $(TARGET).cc
 	$(CXX) -o $@ $^
 
+clean:
+	-rm -f $(TARGET) *~
+
 .PHONY: test
 test:
 	./$(TARGET) test-impossible.txt