diff --git a/Makefile b/Makefile
index 26e5eded..8767fb3c 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,7 @@ doc:	README.md
 clean:
 	cd tests && make clean
 	cd example && make clean
+	cd bench && make clean
 	$(RM) -f README.html
 
 install: