diff --git a/tests/test_litellm/proxy/_experimental/mcp_server/test_mcp_max_concurrent_requests.py b/tests/test_litellm/proxy/_experimental/mcp_server/test_mcp_max_concurrent_requests.py
index 0dc7ac5ecd9..1f426bddc3b 100644
--- a/tests/test_litellm/proxy/_experimental/mcp_server/test_mcp_max_concurrent_requests.py
+++ b/tests/test_litellm/proxy/_experimental/mcp_server/test_mcp_max_concurrent_requests.py
@@ -47,7 +47,7 @@ def _make_server(server_id: str, max_concurrent_requests: Optional[int]) -> MCPS
 def _patch_client_with_tracker(manager: MCPServerManager, tracker: _ConcurrencyTracker):
     async def fake_create_mcp_client(server, **kwargs):
         class _ProbeClient:
-            async def call_tool(self, params, host_progress_callback=None, allow_input_required=False):
+            async def call_tool(self, params, host_progress_callback=None, allow_input_required=False, raise_on_error: bool = False):
                 tracker.enter(server.server_id)
                 try:
                     await asyncio.sleep(HOLD_SECONDS)