diff --git a/apps/wpm/services.py b/apps/wpm/services.py
index 6a5004d8..2ee1aa96 100644
--- a/apps/wpm/services.py
+++ b/apps/wpm/services.py
@@ -43,7 +43,7 @@ def make_sflogs(mgroup: Mgroup, start_date: datetime.date, end_date: datetime.da
                     end_time += datetime.timedelta(days=1)
                 else:
                     start_time -= datetime.timedelta(days=1)
-            total_sec = (end_time - start_time).total_seconds
+            total_sec = (end_time - start_time).total_seconds()
             total_hour = total_sec / 3600
             SfLog.objects.get_or_create(mgroup=mgroup, shift=shift, start_time=start_time, defaults={
                 "mgroup": mgroup,