diff --git a/backend/fluksio/flow/runs.py b/backend/fluksio/flow/runs.py
index 476bed4..31ecee0 100644
--- a/backend/fluksio/flow/runs.py
+++ b/backend/fluksio/flow/runs.py
@@ -1430,6 +1430,8 @@ class RunService:
                 .where(col(Run.id) == run_id, col(Run.status) == "queued")
                 .values(
                     status="running",
+                    # A "Waiting for a worker" from the queue no longer holds.
+                    status_reason="",
                     started_at=now,
                     lease_at=now,
                     engine=self.engine_name,