diff --git a/benchmark/cluster/echo.js b/benchmark/cluster/echo.js
index bedfa063257..71ded75c9d2 100644
--- a/benchmark/cluster/echo.js
+++ b/benchmark/cluster/echo.js
@@ -1,7 +1,7 @@
 'use strict';
 
 const cluster = require('cluster');
-if (cluster.isMaster) {
+if (cluster.isPrimary) {
   const common = require('../common.js');
   const bench = common.createBenchmark(main, {
     workers: [1],
diff --git a/benchmark/http/cluster.js b/benchmark/http/cluster.js
index ea0d925d8c9..789bfc0e4dc 100644
--- a/benchmark/http/cluster.js
+++ b/benchmark/http/cluster.js
@@ -4,7 +4,7 @@ const PORT = common.PORT;
 
 const cluster = require('cluster');
 let bench;
-if (cluster.isMaster) {
+if (cluster.isPrimary) {
   bench = common.createBenchmark(main, {
     // Unicode confuses ab on os x.
     type: ['bytes', 'buffer'],