diff --git a/Makefile b/Makefile
index 5b7ee17..3188b3a 100644
--- a/Makefile
+++ b/Makefile
@@ -39,6 +39,7 @@ count:
 clean:
 	find . -name \*.pyc -delete
 	find . -name \*.pyo -delete
+	rm -rf build
 
 .PHONY: test
 test: