diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ GRUNT=./node_binaries/grunt
 clean:
 	make test-clean
 	find . -type f \( -iname '*.c' -o -iname '*.pyc' -o -iname '*.so' -o -iname '*.orig' \) -exec rm '{}' ';'
-
+	find . -type d -name "build" -prune -exec rm -rf '{}' ';'
 
 .PHONY: test
 ## run test-clean and tests