diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index cea5479508c..c24586d76b1 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -1094,7 +1094,7 @@ async def _PROXY_track_cost_callback(
     global prisma_client, custom_db_client
     try:
         # check if it has collected an entire stream response
-        verbose_proxy_logger.debug("Proxy: In track_cost_callback for: ", extra=kwargs)
+        verbose_proxy_logger.debug("Proxy: In track_cost_callback for: %s", kwargs)
         verbose_proxy_logger.debug(
             f"kwargs stream: {kwargs.get('stream', None)} + complete streaming response: {kwargs.get('complete_streaming_response', None)}"
         )