diff --git a/src/core/worker.js b/src/core/worker.js
index 3f8c73379..1e9a807ec 100644
--- a/src/core/worker.js
+++ b/src/core/worker.js
@@ -303,7 +303,7 @@ class WorkerMessageHandler {
         }
         cachedChunks = [];
       };
-      const readPromise = new Promise(function (resolve, reject) {
+      new Promise(function (resolve, reject) {
         const readChunk = function ({ value, done }) {
           try {
             ensureNotTerminated();
@@ -335,8 +335,7 @@ class WorkerMessageHandler {
           }
         };
         fullRequest.read().then(readChunk, reject);
-      });
-      readPromise.catch(function (e) {
+      }).catch(function (e) {
         pdfManagerCapability.reject(e);
         cancelXHRs = null;
       });