diff --git a/test/pummel/test-child-process-spawn-loop.js b/test/pummel/test-child-process-spawn-loop.js
index 98653a7360b269..f6d8207df85b9b 100644
--- a/test/pummel/test-child-process-spawn-loop.js
+++ b/test/pummel/test-child-process-spawn-loop.js
@@ -34,11 +34,11 @@ function doSpawn(i) {
   let count = 0;
 
   child.stdout.setEncoding('ascii');
-  child.stdout.on('data', chunk => {
+  child.stdout.on('data', (chunk) => {
     count += chunk.length;
   });
 
-  child.stderr.on('data', chunk => {
+  child.stderr.on('data', (chunk) => {
     console.log(`stderr: ${chunk}`);
   });