diff --git a/services/web/frontend/js/serviceWorker.js b/services/web/frontend/js/serviceWorker.js
index 561ef14373..a7db35a29f 100644
--- a/services/web/frontend/js/serviceWorker.js
+++ b/services/web/frontend/js/serviceWorker.js
@@ -415,7 +415,7 @@ function processPdfRequest(
           if (offsetStart > 0 || offsetEnd > 0) {
             // compute index positions for slice to handle case where offsetEnd=0
             const chunkSize = chunk.end - chunk.start
-            data = data.slice(offsetStart, chunkSize - offsetEnd)
+            data = data.subarray(offsetStart, chunkSize - offsetEnd)
           }
           const insertPosition = Math.max(chunk.start - start, 0)
           reAssembledBlob.set(data, insertPosition)