diff --git a/pkg/rpcclient/convert/convert.go b/pkg/rpcclient/convert/convert.go
index 5fd08027f..dc008c9c7 100644
--- a/pkg/rpcclient/convert/convert.go
+++ b/pkg/rpcclient/convert/convert.go
@@ -249,7 +249,6 @@ func (db *DBBlack) Convert(ctx context.Context) (*sdk.BlackInfo, error) {
 
 type DBGroup struct {
 	*relation.GroupModel
-	zk         discoveryRegistry.SvcDiscoveryRegistry
 	groupCheck *check.GroupChecker
 }