diff --git a/chrome/content/zotero/xpcom/storage/zfs.js b/chrome/content/zotero/xpcom/storage/zfs.js
index a982e6490c..31fefee6c7 100644
--- a/chrome/content/zotero/xpcom/storage/zfs.js
+++ b/chrome/content/zotero/xpcom/storage/zfs.js
@@ -533,6 +533,11 @@ Zotero.Sync.Storage.Mode.ZFS.prototype = {
 				return "ERROR_412_WITHOUT_VERSION";
 			}
 			if (version > item.version) {
+				// Mark object for redownloading, in case the library version is up to date and
+				// it's just the attachment item that somehow didn't get updated
+				yield Zotero.Sync.Data.Local.addObjectsToSyncQueue(
+					'item', item.libraryID, [item.key]
+				);
 				return new Zotero.Sync.Storage.Result({
 					syncRequired: true
 				});
@@ -558,6 +563,11 @@ Zotero.Sync.Storage.Mode.ZFS.prototype = {
 			json = json[0];
 			
 			if (json.data.version > item.version) {
+				// Mark object for redownloading, in case the library version is up to date and
+				// it's just the attachment item that somehow didn't get updated
+				yield Zotero.Sync.Data.Local.addObjectsToSyncQueue(
+					'item', item.libraryID, [item.key]
+				);
 				return new Zotero.Sync.Storage.Result({
 					syncRequired: true
 				});
diff --git a/test/tests/zfsTest.js b/test/tests/zfsTest.js
index 41bd1d9659..f6d572868b 100644
--- a/test/tests/zfsTest.js
+++ b/test/tests/zfsTest.js
@@ -985,6 +985,9 @@ describe("Zotero.Sync.Storage.Mode.ZFS", function () {
 			assert.isFalse(result.localChanges);
 			assert.isFalse(result.remoteChanges);
 			assert.isTrue(result.syncRequired);
+			// Item should be marked for redownloading
+			var versions = yield Zotero.Sync.Data.Local.getObjectsFromSyncQueue('item', item.libraryID);
+			assert.include(versions, item.key);
 		});