diff --git a/src/RpcMethodImpl.cc b/src/RpcMethodImpl.cc
index 8dad61c3..faa82e0a 100644
--- a/src/RpcMethodImpl.cc
+++ b/src/RpcMethodImpl.cc
@@ -1436,7 +1436,7 @@ std::unique_ptr<ValueBase> SystemListMethodsRpcMethod::process
     list->append(s);
   }
 
-  return list;
+  return std::move(list);
 }
 
 RpcResponse SystemListMethodsRpcMethod::execute(RpcRequest req,