diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index c97934e9471..493c7b38970 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -5127,8 +5127,9 @@ class ProxyConfig:
                                 # instance already exists from an earlier registration
                                 if callback in litellm.success_callback:
                                     litellm.success_callback.remove(callback)
-                                _add_custom_logger_callback_to_specific_event(  # pyright: ignore[reportPrivateUsage]  # mirrors the DB-config registration path
-                                    callback, "success"
+                                _add_custom_logger_callback_to_specific_event(  # pyright: ignore[reportPrivateUsage]
+                                    callback,
+                                    "success",  # mirrors the DB-config registration path
                                 )
                             else:
                                 litellm.logging_callback_manager.add_litellm_success_callback(callback)
@@ -5161,8 +5162,9 @@ class ProxyConfig:
                             if callback in litellm._known_custom_logger_compatible_callbacks:
                                 if callback in litellm.failure_callback:
                                     litellm.failure_callback.remove(callback)
-                                _add_custom_logger_callback_to_specific_event(  # pyright: ignore[reportPrivateUsage]  # mirrors the DB-config registration path
-                                    callback, "failure"
+                                _add_custom_logger_callback_to_specific_event(  # pyright: ignore[reportPrivateUsage]
+                                    callback,
+                                    "failure",  # mirrors the DB-config registration path
                                 )
                             else:
                                 litellm.logging_callback_manager.add_litellm_failure_callback(callback)