diff --git a/tests/test_litellm/test_router_retry_policy_update.py b/tests/test_litellm/test_router_retry_policy_update.py
index 2c23d0da7e7..db710f76887 100644
--- a/tests/test_litellm/test_router_retry_policy_update.py
+++ b/tests/test_litellm/test_router_retry_policy_update.py
@@ -21,6 +21,7 @@ This file pins both halves of the fix.
 
 import json
 from dataclasses import dataclass
+from typing import Final
 from unittest.mock import AsyncMock, MagicMock
 
 import pytest
@@ -33,6 +34,14 @@ from litellm.router_utils.pre_call_checks.model_rate_limit_check import ModelRat
 from litellm.router_utils.pre_call_checks.prompt_caching_deployment_check import PromptCachingDeploymentCheck
 from litellm.types.router import RetryPolicy, UpdateRouterConfig
 
+
+@pytest.fixture(autouse=True)
+def isolate_litellm_callbacks():
+    callbacks_before: Final = litellm.callbacks.copy()
+    yield
+    litellm.callbacks = callbacks_before
+
+
 # ---------------------------------------------------------------------------
 # UpdateRouterConfig schema membership (LIT-3152 part 1)
 # ---------------------------------------------------------------------------