diff --git a/lib/galaxy/authnz/custos_authnz.py b/lib/galaxy/authnz/custos_authnz.py
index 5236d84924b9..4974ff57a122 100644
--- a/lib/galaxy/authnz/custos_authnz.py
+++ b/lib/galaxy/authnz/custos_authnz.py
@@ -99,7 +99,7 @@ def __init__(self, provider, oidc_config, oidc_backend_config, idphint=None):
                 )
             ),
             extra_params={},
-            extra_scopes=oidc_backend_config.get("extra_scopes",[]),
+            extra_scopes=oidc_backend_config.get("extra_scopes", []),
             authorization_endpoint=None,
             token_endpoint=None,
             end_session_endpoint=None,