diff --git a/zrpc/config.go b/zrpc/config.go
index 80f3bd2e..afbb4882 100644
--- a/zrpc/config.go
+++ b/zrpc/config.go
@@ -27,7 +27,7 @@ type (
 		Token         string          `json:",optional"`
 		NonBlock      bool            `json:",optional"`
 		Timeout       int64           `json:",default=2000"`
-		KeepaliveTime time.Duration   `json:",default=20s"`
+		KeepaliveTime time.Duration   `json:",optional"`
 		Middlewares   ClientMiddlewaresConf
 	}