diff --git a/manifest.json b/manifest.json
index 19339e5..c717336 100644
--- a/manifest.json
+++ b/manifest.json
@@ -27,7 +27,7 @@
 			"language_id": "en",
 			"resource_id": "ulb",
 			"checking_level": "3",
-			"date_modified": '20170329',
+			"date_modified": "20170329",
 			"version": "9"
 		}
 	],