diff --git a/test/fixtures/cluster-preload-test.js b/test/fixtures/cluster-preload-test.js
index 0094fe6657fd7c..570cb83bdc496e 100644
--- a/test/fixtures/cluster-preload-test.js
+++ b/test/fixtures/cluster-preload-test.js
@@ -2,6 +2,6 @@ const cluster = require('cluster');
 if (cluster.isMaster) {
   cluster.fork(); // one child
   cluster.on('exit', function(worker, code, signal) {
-    console.log('worker terminated with code ' + code);
+    console.log(`worker terminated with code ${code}`);
   });
 }