diff --git a/chrome/content/zotero/xpcom/reader.js b/chrome/content/zotero/xpcom/reader.js
index b388c2d621..ce2657d18d 100644
--- a/chrome/content/zotero/xpcom/reader.js
+++ b/chrome/content/zotero/xpcom/reader.js
@@ -531,14 +531,8 @@ class ReaderInstance {
 		if (fileSize > ARRAYBUFFER_MAX_LENGTH) {
 			throw new Error(`The file "${path}" is too large`);
 		}
-		let buf;
-		if (this._type !== 'pdf') {
-			buf = await OS.File.read(path, {});
-		}
-		let baseURI = `zotero://attachment/${Zotero.API.getLibraryPrefix(item.libraryID)}/items/${item.key}/`;
 		return {
-			buf,
-			baseURI
+			url: `zotero://attachment/${Zotero.API.getLibraryPrefix(item.libraryID)}/items/${item.key}/`
 		};
 	}
 
diff --git a/reader b/reader
index 81863a19d7..c13fd93c26 160000
--- a/reader
+++ b/reader
@@ -1 +1 @@
-Subproject commit 81863a19d7f62685e6c3ab8ce893647b9dfb7351
+Subproject commit c13fd93c26ea118f48f2a4c0495e21131b4e3180