diff --git a/chrome/content/zotero/xpcom/storage.js b/chrome/content/zotero/xpcom/storage.js
index d149a33534..8e38cc6b5a 100644
--- a/chrome/content/zotero/xpcom/storage.js
+++ b/chrome/content/zotero/xpcom/storage.js
@@ -211,11 +211,8 @@ Zotero.Sync.Storage = new function () {
 		
 		if (updateItem) {
 			// Update item date modified so the new mod time will be synced
-			var item = Zotero.Items.get(itemID);
-			//var date = new Date(mtime * 1000);
-			//item.setField('dateModified', Zotero.Date.dateToSQL(date, true));
-			item.setField('dateModified', Zotero.DB.transactionDateTime);
-			item.save();
+			var sql = "UPDATE items SET clientDateModified=? WHERE itemID=?";
+			Zotero.DB.query(sql, [Zotero.DB.transactionDateTime, itemID]);
 		}
 		
 		Zotero.DB.commitTransaction();
@@ -254,10 +251,9 @@ Zotero.Sync.Storage = new function () {
 		Zotero.DB.valueQuery(sql, [hash, itemID]);
 		
 		if (updateItem) {
-			// Update item date modified so the new hash will be synced
-			var item = Zotero.Items.get(itemID);
-			item.setField('dateModified', Zotero.DB.transactionDateTime);
-			item.save();
+			// Update item date modified so the new mod time will be synced
+			var sql = "UPDATE items SET clientDateModified=? WHERE itemID=?";
+			Zotero.DB.query(sql, [Zotero.DB.transactionDateTime, itemID]);
 		}
 		
 		Zotero.DB.commitTransaction();
diff --git a/chrome/content/zotero/xpcom/storage/webdav.js b/chrome/content/zotero/xpcom/storage/webdav.js
index de26b374d1..49b32b9e28 100644
--- a/chrome/content/zotero/xpcom/storage/webdav.js
+++ b/chrome/content/zotero/xpcom/storage/webdav.js
@@ -515,7 +515,7 @@ Zotero.Sync.Storage.Session.WebDAV.prototype._onUploadComplete = function (httpR
 		Zotero.Sync.Storage.setSyncedModificationTime(item.id, mtime, true);
 		
 		var hash = item.attachmentHash;
-		Zotero.Sync.Storage.setSyncedHash(item.id, hash, true);
+		Zotero.Sync.Storage.setSyncedHash(item.id, hash);
 		
 		Zotero.DB.commitTransaction();
 		
diff --git a/chrome/content/zotero/xpcom/storage/zfs.js b/chrome/content/zotero/xpcom/storage/zfs.js
index 5354f5c4eb..a30c830d3c 100644
--- a/chrome/content/zotero/xpcom/storage/zfs.js
+++ b/chrome/content/zotero/xpcom/storage/zfs.js
@@ -633,12 +633,12 @@ Zotero.Sync.Storage.Session.ZFS.prototype._updateItemFileInfo = function (item)
 	
 	// Store file mod time
 	var mtime = item.attachmentModificationTime;
-	Zotero.Sync.Storage.setSyncedModificationTime(item.id, mtime, false);
+	Zotero.Sync.Storage.setSyncedModificationTime(item.id, mtime, true);
 	
 	// Store file hash of individual files
 	if (Zotero.Attachments.getNumFiles(item) == 1) {
 		var hash = item.attachmentHash;
-		Zotero.Sync.Storage.setSyncedHash(item.id, hash, true);
+		Zotero.Sync.Storage.setSyncedHash(item.id, hash);
 	}
 	
 	Zotero.DB.commitTransaction();