diff --git a/src/shared/shared/week_keys.py b/src/shared/shared/week_keys.py
index e16cac6..7217a32 100644
--- a/src/shared/shared/week_keys.py
+++ b/src/shared/shared/week_keys.py
@@ -9,6 +9,7 @@ This is not a mapping from WEEK# onto Flex payPeriodId.
 
 from __future__ import annotations
 
+import math
 import re
 from datetime import datetime