diff --git a/lib/internal/worker/io.js b/lib/internal/worker/io.js
index d249ba8508b7af..ad8056b5b9108a 100644
--- a/lib/internal/worker/io.js
+++ b/lib/internal/worker/io.js
@@ -62,7 +62,8 @@ MessagePort.prototype.unref = MessagePortPrototype.unref;
 // .onmessage events, and a function used for sending data to a MessagePort
 // in some other thread.
 MessagePort.prototype[kOnMessageListener] = function onmessage(payload) {
-  debug(`[${threadId}] received message`, payload);
+  if (payload.type !== messageTypes.STDIO_WANTS_MORE_DATA)
+    debug(`[${threadId}] received message`, payload);
   // Emit the deserialized object to userland.
   this.emit('message', payload);
 };