diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index f75a3ff562..6e1f0521f2 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -55,7 +55,7 @@ class ProxyLogging:
         ## INITIALIZE  LITELLM CALLBACKS ##
         self.call_details: dict = {}
         self.call_details["user_api_key_cache"] = user_api_key_cache
-        # self.max_parallel_request_limiter = _PROXY_MaxParallelRequestsHandler()
+        self.max_parallel_request_limiter = _PROXY_MaxParallelRequestsHandler()
         self.max_tpm_rpm_limiter = _PROXY_MaxTPMRPMLimiter(
             redis_usage_cache=redis_usage_cache
         )
@@ -74,7 +74,7 @@ class ProxyLogging:
 
     def _init_litellm_callbacks(self):
         print_verbose(f"INITIALIZING LITELLM CALLBACKS!")
-        # litellm.callbacks.append(self.max_parallel_request_limiter)
+        litellm.callbacks.append(self.max_parallel_request_limiter)
         litellm.callbacks.append(self.max_tpm_rpm_limiter)
         litellm.callbacks.append(self.max_budget_limiter)
         litellm.callbacks.append(self.cache_control_check)