diff --git a/test_runner/regress/test_attach_tenant_config.py b/test_runner/regress/test_attach_tenant_config.py
index 6f43fc8115..679cd038b3 100644
--- a/test_runner/regress/test_attach_tenant_config.py
+++ b/test_runner/regress/test_attach_tenant_config.py
@@ -190,7 +190,7 @@ def test_fully_custom_config(positive_env: NeonEnv):
         "trace_read_requests": True,
         "walreceiver_connect_timeout": "13m",
         "image_layer_creation_check_threshold": 1,
-        "aux_file_v2": True,
+        "try_enable_aux_file_v2": True,
     }
 
     ps_http = env.pageserver.http_client()