diff --git a/config/example-standalone.toml b/config/example-standalone.toml
index ed5a0a84..cc25492f 100644
--- a/config/example-standalone.toml
+++ b/config/example-standalone.toml
@@ -7,7 +7,6 @@ data-dir = "/tmp/ceresmeta0"
 node-name = "meta0"
 initial-cluster = "meta0=http://127.0.0.1:2380"
 default-cluster-node-count = 2
-max-concurrent-open-shard-batch-size = 1
 
 [log]
 level = "info"