diff --git a/test_runner/fixtures/pageserver/allowed_errors.py b/test_runner/fixtures/pageserver/allowed_errors.py
index 164c6ececc..5461424cc9 100755
--- a/test_runner/fixtures/pageserver/allowed_errors.py
+++ b/test_runner/fixtures/pageserver/allowed_errors.py
@@ -127,6 +127,7 @@ DEFAULT_STORAGE_CONTROLLER_ALLOWED_ERRORS = [
     # Tests run in dev mode
     ".*Starting in dev mode.*",
     ".*Starting in dev mode - authentication security checks are disabled.*",
+    ".*Starting in dev mode: this may be an insecure configuration.*",
     # Tests that stop endpoints & use the storage controller's neon_local notification
     # mechanism might fail (neon_local's stopping and endpoint isn't atomic wrt the storage
     # controller's attempts to notify the endpoint).