diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5dd7a189fc..6259c18c8b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1156,6 +1156,7 @@ jobs:
             pip install "requests-mock>=1.12.1"
             pip install "responses==0.25.7"
             pip install "pytest-xdist==3.6.1"
+            pip install "pytest-forked==1.6.0"
             pip install "semantic_router==0.1.10"
             pip install "fastapi-offline==1.7.3"
       - setup_litellm_enterprise_pip
diff --git a/tests/test_model_cost_map_url.py b/tests/test_model_cost_map_url.py
index b740c35719..f19fc3a198 100644
--- a/tests/test_model_cost_map_url.py
+++ b/tests/test_model_cost_map_url.py
@@ -1,9 +1,16 @@
 import importlib
 import sys
+import pytest
 
 
+@pytest.mark.forked
 def test_model_cost_map_url_from_env(monkeypatch):
-    """Ensure `LITELLM_MODEL_COST_MAP_URL` env var is picked up on import and used by get_model_cost_map."""
+    """
+    Ensure `LITELLM_MODEL_COST_MAP_URL` env var is picked up on import and used by get_model_cost_map.
+    
+    This test reloads the litellm module, so it runs in a forked process to avoid
+    affecting other tests running in parallel.
+    """
     test_url = "https://example.com/test_model_cost_map.json"
 
     # A minimal model cost map we expect to be loaded