diff --git a/backend/functions/letta_agents.py b/backend/functions/letta_agents.py
index 808ba23ff..b28d8c8b0 100644
--- a/backend/functions/letta_agents.py
+++ b/backend/functions/letta_agents.py
@@ -39,7 +39,8 @@ class Pipe:
 
         return Letta(
             base_url=self.valves.LETTA_BASE_URL,
-            api_key=self.valves.LETTA_API_KEY
+            api_key=self.valves.LETTA_API_KEY,
+            default_headers={"X-Letta-Source": "chat-letta-com"},
         )
 
     def pipes(self) -> list[dict]: