diff --git a/tests/gateway/test_api_server.py b/tests/gateway/test_api_server.py
index 3892652c3be7..abe8cdd64d34 100644
--- a/tests/gateway/test_api_server.py
+++ b/tests/gateway/test_api_server.py
@@ -3887,7 +3887,7 @@ def _patch_create_agent_runtime(monkeypatch, captured: dict, fake_agent_cls):
     monkeypatch.setattr("gateway.run._resolve_gateway_model", lambda: "global/model")
     monkeypatch.setattr("gateway.run._load_gateway_config", lambda: {})
     monkeypatch.setattr(
-        "gateway.run.GatewayRunner._load_reasoning_config", staticmethod(lambda: {})
+        "gateway.run.GatewayRunner._load_reasoning_config", staticmethod(lambda model="": {})
     )
     monkeypatch.setattr(
         "gateway.run.GatewayRunner._load_fallback_model", staticmethod(lambda: None)
diff --git a/tests/test_tui_gateway_server.py b/tests/test_tui_gateway_server.py
index b8b0bbd77322..f117af57a63e 100644
--- a/tests/test_tui_gateway_server.py
+++ b/tests/test_tui_gateway_server.py
@@ -7596,7 +7596,7 @@ def _setup_make_agent_mocks(monkeypatch, cfg):
         },
     )
     monkeypatch.setattr(server, "_load_tool_progress_mode", lambda: "off")
-    monkeypatch.setattr(server, "_load_reasoning_config", lambda: None)
+    monkeypatch.setattr(server, "_load_reasoning_config", lambda model="": None)
     monkeypatch.setattr(server, "_load_service_tier", lambda: None)
     monkeypatch.setattr(server, "_load_enabled_toolsets", lambda: None)
     monkeypatch.setattr(server, "_get_db", lambda: None)