diff --git a/openmemory/api/app/mcp_server.py b/openmemory/api/app/mcp_server.py
index 0911a0dac..ab31c7707 100644
--- a/openmemory/api/app/mcp_server.py
+++ b/openmemory/api/app/mcp_server.py
@@ -133,7 +133,7 @@ async def add_memories(text: str) -> str:
 
                 db.commit()
 
-            return response
+            return json.dumps(response)
         finally:
             db.close()
     except Exception as e: