diff --git a/posthog/temporal/workflows/backfill_batch_export.py b/posthog/temporal/workflows/backfill_batch_export.py
index 21f8c21398633..10cc2d31d42ed 100644
--- a/posthog/temporal/workflows/backfill_batch_export.py
+++ b/posthog/temporal/workflows/backfill_batch_export.py
@@ -123,7 +123,7 @@ async def backfill_schedule(inputs: BackfillScheduleInputs) -> None:
     if details:
         # If we receive details from a previous run, it means we were restarted for some reason.
         # Let's not double-backfill and instead wait for any outstanding runs.
-        last_activity_details = details[0]
+        last_activity_details = HeartbeatDetails(*details[0])
 
         details = HeartbeatDetails(
             schedule_id=inputs.schedule_id,