diff --git a/test_runner/regress/test_remote_storage.py b/test_runner/regress/test_remote_storage.py
index b865e3ce24..0bd365efaa 100644
--- a/test_runner/regress/test_remote_storage.py
+++ b/test_runner/regress/test_remote_storage.py
@@ -604,6 +604,7 @@ def test_timeline_deletion_with_files_stuck_in_upload_queue(
     checkpoint_allowed_to_fail.set()
     env.pageserver.allowed_errors.append(
         ".* ERROR .*Error processing HTTP request: InternalServerError\\(timeline is Stopping"
+        ".* ERROR .*[Cc]ould not flush frozen layer.*"
     )
 
     # Generous timeout, because currently deletions can get blocked waiting for compaction