diff --git a/include/nebula/client/Session.h b/include/nebula/client/Session.h
index 41bcea88..8069a6ff 100644
--- a/include/nebula/client/Session.h
+++ b/include/nebula/client/Session.h
@@ -68,7 +68,7 @@ class Session {
         return sessionId_ > 0;
     }
 
-    const auto& timeZoneName() const {
+    const std::string& timeZoneName() const {
         return timezoneName_;
     }