diff --git a/files/usr/lib/koji-hub-plugins/key_signing.py b/files/usr/lib/koji-hub-plugins/key_signing.py
index ea41903..a4abbcc 100644
--- a/files/usr/lib/koji-hub-plugins/key_signing.py
+++ b/files/usr/lib/koji-hub-plugins/key_signing.py
@@ -11,6 +11,7 @@
 import sys
 import logging
 import subprocess
+import os
 
 import koji
 from koji.plugin import register_callback, ignore_error