diff --git a/packages/terminal/src/pty/PTT.js b/packages/terminal/src/pty/PTT.js
index ff122b8f..c39d0839 100644
--- a/packages/terminal/src/pty/PTT.js
+++ b/packages/terminal/src/pty/PTT.js
@@ -21,6 +21,7 @@
  */
 export class PTT {
     constructor(pty) {
+        const encoder = new TextEncoder();
         this.readableStream = new ReadableStream({
             start: controller => {
                 this.readController = controller;