diff --git a/lib/internal/main/worker_thread.js b/lib/internal/main/worker_thread.js
index a5816f1f1cf4ee..a8167b86ca2e5a 100644
--- a/lib/internal/main/worker_thread.js
+++ b/lib/internal/main/worker_thread.js
@@ -164,7 +164,7 @@ port.on('message', (message) => {
       process.stdin.push(null);
 
     debug(`[${threadId}] starts worker script ${filename} ` +
-          `(eval = ${eval}) at cwd = ${process.cwd()}`);
+          `(eval = ${doEval}) at cwd = ${process.cwd()}`);
     port.postMessage({ type: UP_AND_RUNNING });
     if (doEval === 'classic') {
       const { evalScript } = require('internal/process/execution');