diff --git a/tests/test_litellm/integrations/test_langfuse_otel.py b/tests/test_litellm/integrations/test_langfuse_otel.py
index ba4a096be2..62851b8f99 100644
--- a/tests/test_litellm/integrations/test_langfuse_otel.py
+++ b/tests/test_litellm/integrations/test_langfuse_otel.py
@@ -157,8 +157,12 @@ class TestLangfuseOtelIntegration:
 
         stub_module.LangFuseLogger = StubLFLogger  # type: ignore
 
-        # Register stub in sys.modules so import inside method succeeds
-        sys.modules["litellm.integrations.langfuse.langfuse"] = stub_module  # type: ignore
+        # Register stub in sys.modules so import inside method succeeds.
+        # Use monkeypatch so the real module is restored after the test runs,
+        # preventing sys.modules corruption that would break patch() targets in
+        # later tests (the patch would hit the stub while the real module's
+        # globals remain unpatch-ed).
+        monkeypatch.setitem(sys.modules, "litellm.integrations.langfuse.langfuse", stub_module)  # type: ignore
 
         kwargs = {"litellm_params": {"metadata": {"foo": "bar"}}}
         extracted = LangfuseOtelLogger._extract_langfuse_metadata(kwargs)