diff --git a/tests/test_litellm/proxy/_experimental/mcp_server/auth/test_user_api_key_auth_mcp.py b/tests/test_litellm/proxy/_experimental/mcp_server/auth/test_user_api_key_auth_mcp.py
index 52dc91ce24d..9f5ff944b77 100644
--- a/tests/test_litellm/proxy/_experimental/mcp_server/auth/test_user_api_key_auth_mcp.py
+++ b/tests/test_litellm/proxy/_experimental/mcp_server/auth/test_user_api_key_auth_mcp.py
@@ -5671,15 +5671,17 @@ class TestMCPDcrBridgeDelegateAdmission:
                 )
         return exc_info.value
 
-    async def test_over_budget_admission_surfaces_429_not_401(self):
+    async def test_over_budget_admission_surfaces_429_not_401(self, monkeypatch):
         """A validly-authenticated but over-budget identity surfaces the standard pipeline's 429, not
         a misleading 401. Flattening budget to 401 told the caller their credential was invalid, which
         on a DCR client reads as broken auth and triggers a re-authorize that cannot fix a budget
         problem. Regression for the status-flattening finding on the live-policy gate."""
         import litellm
 
+        monkeypatch.setattr(litellm, "budget_exceeded_error_message", "Allowance reached")
         mapped = await self._enforce_with_gate_error(litellm.BudgetExceededError(current_cost=10.0, max_budget=1.0))
         assert mapped.status_code == 429
+        assert mapped.detail == "Allowance reached"
 
     async def test_db_outage_during_policy_surfaces_503_not_401(self):
         """A transient database outage during the live-policy gate surfaces a retryable 503, not a 401