diff --git a/source/custombuild.py b/source/custombuild.py
index bfed79f..be8f269 100755
--- a/source/custombuild.py
+++ b/source/custombuild.py
@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import os
+import sys
 import subprocess
 import shutil
 import burger