diff --git a/list-calendar-events.py b/list-calendar-events.py
index caf6d1b..b737b35 100755
--- a/list-calendar-events.py
+++ b/list-calendar-events.py
@@ -9,6 +9,7 @@
 
 #=== MODULES ===================================================================
 
+import sys
 from ics import Calendar
 
 #=== INFO ======================================================================