diff --git a/Makefile b/Makefile
index 597f58a..463eeda 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,7 @@
+.PHONY: all clean
+
 all:
 	ghc --make cnb.hs -o cnb
+
+clean:
+	-@rm *.hi *.o cnb 2&> /dev/null || true