diff --git a/src/sentry/workflow_engine/endpoints/serializers.py b/src/sentry/workflow_engine/endpoints/serializers.py
index c73432c84de8c6..ad695024931ec8 100644
--- a/src/sentry/workflow_engine/endpoints/serializers.py
+++ b/src/sentry/workflow_engine/endpoints/serializers.py
@@ -403,6 +403,7 @@ def get_attrs(
             WorkflowFireHistory.objects.filter(
                 workflow__in=item_list,
             )
+            .values("workflow_id")
             .annotate(last_triggered=Max("date_added"))
             .values_list("workflow_id", "last_triggered")
         )
diff --git a/tests/sentry/workflow_engine/endpoints/test_serializers.py b/tests/sentry/workflow_engine/endpoints/test_serializers.py
index afa565112925a0..5f7aa5f4e9e7a0 100644
--- a/tests/sentry/workflow_engine/endpoints/test_serializers.py
+++ b/tests/sentry/workflow_engine/endpoints/test_serializers.py
@@ -454,8 +454,14 @@ def test_serialize_full(self) -> None:
             workflow=workflow,
             group=self.group,
             event_id=self.event.event_id,
-            date_added=workflow.date_added + timedelta(seconds=1),
         )
+        WorkflowFireHistory.objects.create(
+            workflow=workflow,
+            group=self.group,
+            event_id=self.event.event_id,
+        )
+        history.date_added = workflow.date_added + timedelta(seconds=1)
+        history.save()
 
         result = serialize(workflow)