diff --git a/lib/internal/worker.js b/lib/internal/worker.js
index 093efde3a5d7ba..d9e0f9f516aba9 100644
--- a/lib/internal/worker.js
+++ b/lib/internal/worker.js
@@ -215,7 +215,7 @@ class Worker extends EventEmitter {
     this[kDispose]();
     if (customErr) {
       debug(`[${threadId}] failing with custom error ${customErr} \
-        and with reason {customErrReason}`);
+        and with reason ${customErrReason}`);
       this.emit('error', new errorCodes[customErr](customErrReason));
     }
     this.emit('exit', code);