diff --git a/gramps/plugins/lib/libholiday.py b/gramps/plugins/lib/libholiday.py
index a83e69535..11f5a2194 100644
--- a/gramps/plugins/lib/libholiday.py
+++ b/gramps/plugins/lib/libholiday.py
@@ -34,6 +34,7 @@ import datetime
 import math
 from gramps.gen.const import PLUGINS_DIR, USER_PLUGINS
 import os
+import sys
 
 #------------------------------------------------------------------------
 #