diff --git a/app/api/langchain/tool/agent/agentapi.ts b/app/api/langchain/tool/agent/agentapi.ts
index a6e42d4a2..75849ea58 100644
--- a/app/api/langchain/tool/agent/agentapi.ts
+++ b/app/api/langchain/tool/agent/agentapi.ts
@@ -481,7 +481,7 @@ export class AgentApi {
         tools,
         maxIterations: reqBody.maxIterations,
       });
-      process.env.LANGCHAIN_CALLBACKS_BACKGROUND = true;
+      process.env.LANGCHAIN_CALLBACKS_BACKGROUND = 'true';
       await agentExecutor
         .invoke(
           {