diff --git a/chrome/content/zotero/xpcom/storage.js b/chrome/content/zotero/xpcom/storage.js
index d48e1c86f..a862af4a2 100644
--- a/chrome/content/zotero/xpcom/storage.js
+++ b/chrome/content/zotero/xpcom/storage.js
@@ -528,7 +528,8 @@ Zotero.Sync.Storage = new function () {
 			var fileHash = item.attachmentHash;
 			if (attachmentData[item.id].hash && attachmentData[item.id].hash == fileHash) {
 				Zotero.debug("Mod time didn't match (" + fmtime + "!=" + mtime + ") "
-					+ "but hash did for " + file.leafName + " -- ignoring");
+					+ "but hash did for " + file.leafName + " -- updating file mod time");
+				file.lastModifiedTime = attachmentData[item.id].mtime;
 				continue;
 			}