diff --git a/chrome/content/zotero/xpcom/storage.js b/chrome/content/zotero/xpcom/storage.js
index eb259f84e..ac1940457 100644
--- a/chrome/content/zotero/xpcom/storage.js
+++ b/chrome/content/zotero/xpcom/storage.js
@@ -864,13 +864,14 @@ Zotero.Sync.Storage = new function () {
 						Zotero.debug("Remote mod time for item " + lk + " is " + itemModTimes[item.id]);
 						
 						// Ignore attachments whose stored mod times haven't changed
-						if (row.storageModTime == itemModTimes[id]) {
+						if (row.storageModTime == itemModTimes[item.id]) {
 							Zotero.debug("Storage mod time (" + row.storageModTime + ") "
 								+ "hasn't changed for item " + lk);
 							continue;
 						}
 						
-						Zotero.debug("Marking attachment " + lk + " for download");
+						Zotero.debug("Marking attachment " + lk + " for download "
+							+ "(stored mtime: " + itemModTimes[item.id] + ")");
 						updatedStates[item.id] = Zotero.Sync.Storage.SYNC_STATE_FORCE_DOWNLOAD;
 					}