diff --git a/chrome/content/zotero/xpcom/storage/storageEngine.js b/chrome/content/zotero/xpcom/storage/storageEngine.js
index 6142943e43..4d638ced96 100644
--- a/chrome/content/zotero/xpcom/storage/storageEngine.js
+++ b/chrome/content/zotero/xpcom/storage/storageEngine.js
@@ -155,7 +155,7 @@ Zotero.Sync.Storage.Engine.prototype.start = Zotero.Promise.coroutine(function*
 			&& this.local.lastFullFileCheck[libraryID]
 			&& (this.local.lastFullFileCheck[libraryID]
 				+ (this.maxCheckAge * 1000)) > new Date().getTime()) {
-		let itemIDs = this.local.getFilesToCheck(libraryID, this.maxCheckAge);
+		let itemIDs = yield this.local.getFilesToCheck(libraryID, this.maxCheckAge);
 		yield this.local.checkForUpdatedFiles(libraryID, itemIDs);
 	}
 	// Otherwise check all files in library