diff --git a/api/internal/core/store/storehub.go b/api/internal/core/store/storehub.go
index b1e1acf143..f3a9c3016d 100644
--- a/api/internal/core/store/storehub.go
+++ b/api/internal/core/store/storehub.go
@@ -35,7 +35,7 @@ const (
 	HubKeyUpstream   HubKey = "upstream"
 	HubKeyScript     HubKey = "script"
 	HubKeyGlobalRule HubKey = "global_rule"
-	HubKeyServerInfo HubKey = `server_info`
+	HubKeyServerInfo HubKey = "server_info"
 )
 
 var (