diff --git a/lib/modules/ens/index.js b/lib/modules/ens/index.js
index 85b182ed..7329f04d 100644
--- a/lib/modules/ens/index.js
+++ b/lib/modules/ens/index.js
@@ -33,11 +33,7 @@ class ENS {
     this.events.setCommandHandler("storage:ens:associate", this.associateStorageToEns.bind(this));
   }
 
-  setProviderAndRegisterDomains(_cb) {
-    let cb = _cb
-    if (!cb) {
-      cb = function() {}
-    }
+  setProviderAndRegisterDomains(cb = (()=>{})) {
     const self = this;
     async.parallel([
       function getENSRegistry(paraCb) {