diff --git a/polytope_server/common/schedule.py b/polytope_server/common/schedule.py
index ab15431..96a5996 100644
--- a/polytope_server/common/schedule.py
+++ b/polytope_server/common/schedule.py
@@ -12,6 +12,7 @@
 from polytope_feature.utility.exceptions import PolytopeError
 
 schedule_file_path = os.path.join("/etc/polytope_schedule/schedule.xml")
+SCHEDULE_READER = None
 
 
 class ScheduleReader: