diff --git a/scripts/boxes b/scripts/boxes
index 87513a2..db0bc23 100755
--- a/scripts/boxes
+++ b/scripts/boxes
@@ -25,7 +25,7 @@ boxes [NAME] [options]
 def main():
     modules = boxes.generators.getAllGeneratorModules()
     del modules['_template']
-    if sys.argv[1].startswith("--id="):
+    if len(sys.argv) > 1 and sys.argv[1].startswith("--id="):
         del sys.argv[1]
     if len(sys.argv) == 1:
         printusage()