diff --git a/lib/storage/metadata/mongoclient/LogConsumer.js b/lib/storage/metadata/mongoclient/LogConsumer.js
index c539bb637..92a18f13d 100644
--- a/lib/storage/metadata/mongoclient/LogConsumer.js
+++ b/lib/storage/metadata/mongoclient/LogConsumer.js
@@ -2,7 +2,6 @@
 
 const stream = require('stream');
 const MongoClient = require('mongodb').MongoClient;
-const format = require('util').format;
 const { Timestamp } = require('bson');
 
 let lastEndID = undefined;
@@ -109,9 +108,7 @@ class LogConsumer {
         const { replicaSetHosts } = mongoConfig;
         // 'local' is the database where MongoDB has oplogs.rs capped collection
         this.database = 'local';
-        this.mongoUrl = format(
-            'mongodb://%s/local',
-            replicaSetHosts);
+        this.mongoUrl = `mongodb://${replicaSetHosts}/local`;
         this.logger = logger;
     }
 
diff --git a/lib/storage/metadata/mongoclient/MongoClientInterface.js b/lib/storage/metadata/mongoclient/MongoClientInterface.js
index 2f97f4500..5d40fcd09 100644
--- a/lib/storage/metadata/mongoclient/MongoClientInterface.js
+++ b/lib/storage/metadata/mongoclient/MongoClientInterface.js
@@ -11,7 +11,6 @@
  */
 const async = require('async');
 
-const format = require('util').format;
 const constants = require('../../../constants');
 
 const errors = require('../../../errors');
@@ -82,10 +81,8 @@ class MongoClientInterface {
     constructor(params) {
         const { replicaSetHosts, path, database, logger,
             replicationGroupId, replicaSet } = params;
-        this.mongoUrl = format(
-            'mongodb://%s/?replicaSet=%s',
-            replicaSetHosts,
-            replicaSet);
+        this.mongoUrl = `mongodb://${replicaSetHosts}/?replicaSet=` +
+            `${replicaSet}`;
         this.logger = logger;
         this.client = null;
         this.db = null;