diff --git a/src/core/worker.js b/src/core/worker.js
index 17a44d88d..848b6f7e3 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -67,17 +67,14 @@ var WorkerMessageHandler = {
 
       // check if Uint8Array can be sent to worker
       if (!(data instanceof Uint8Array)) {
-        handler.send('test', false);
+        handler.send('test', null);
         return;
       }
       // making sure postMessage transfers are working
-      var supportTransfers = data[0] === 255;
+      const supportTransfers = data[0] === 255;
       handler.postMessageTransfers = supportTransfers;
 
-      handler.send('test', {
-        supportTypedArray: true,
-        supportTransfers,
-      });
+      handler.send('test', { supportTransfers, });
     });
 
     handler.on('configure', function wphConfigure(data) {
diff --git a/src/display/api.js b/src/display/api.js
index a964d52ff..fa41abab7 100644
--- a/src/display/api.js
+++ b/src/display/api.js
@@ -1665,7 +1665,7 @@ const PDFWorker = (function PDFWorkerClosure() {
               terminateEarly();
               return; // worker was destroyed
             }
-            if (data && data.supportTypedArray) {
+            if (data) { // supportTypedArray
               this._messageHandler = messageHandler;
               this._port = worker;
               this._webWorker = worker;