diff --git a/serve/main.py b/serve/main.py
index 3d9f4bedc5e2ecd44d96d3b11005f315e6bbd5c8..a447dfa8b90e19e417d61cfd39977cabecaf83ab 100644
--- a/serve/main.py
+++ b/serve/main.py
@@ -57,4 +57,4 @@ if __name__ == '__main__':
         params = paddle.parameters.Parameters.from_tar(param_f)
         inferer = paddle.inference.Inference(parameters=params, fileobj=topo_f)
     print 'serving on port', port
-    app.run(host='0.0.0.0', port=port, threaded=True)
+    app.run(host='0.0.0.0', port=port, threaded=False)