diff --git a/sheetsync/sheetsync/sheets.py b/sheetsync/sheetsync/sheets.py
index a81689b..c44b8ce 100644
--- a/sheetsync/sheetsync/sheets.py
+++ b/sheetsync/sheetsync/sheets.py
@@ -5,6 +5,7 @@ import uuid
 from monotonic import monotonic
 
 import common
+import common.shifts
 
 from .middleware import Middleware