diff --git a/test/runner/runner.js b/test/runner/runner.js
index 90c14d266365e..d55f269dcba6b 100644
--- a/test/runner/runner.js
+++ b/test/runner/runner.js
@@ -210,10 +210,7 @@ class Worker extends EventEmitter {
         this.stderr.push(data);
     });
     this.on('debug', data => {
-      if (runner._options.dumpio)
-        process.stderr.write(data + '\n');
-      else
-        this.stderr.push(data + '\n');
+      process.stderr.write(data + '\n');
     });
   }