diff --git a/utils/testrunner/Reporter.js b/utils/testrunner/Reporter.js
index f38d498b0f1..3109765e018 100644
--- a/utils/testrunner/Reporter.js
+++ b/utils/testrunner/Reporter.js
@@ -47,7 +47,7 @@ class Reporter {
     }
     console.log('WORKERS STATE');
     const workerIds = Array.from(this._workersState.keys());
-    workerIds.sort();
+    workerIds.sort((a, b) => a - b);
     for (const workerId of workerIds) {
       const {isRunning, test} = this._workersState.get(workerId);
       let description = '';