diff --git a/Makefile b/Makefile
index a41a7dc..94f754b 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,9 @@ all: calc.elf
 check: tests
 	@tests/unittest
 
+clean:
+	rm -f *.o tests/*.o *.elf tests/*.elf
+
 hello.elf: hello.o
 	$(LD) -m elf32lriscv $^ -o $@