diff --git a/src/topics.js b/src/topics.js
index c47b43bc45..13522aad00 100644
--- a/src/topics.js
+++ b/src/topics.js
@@ -61,6 +61,7 @@ var async = require('async'),
 		}
 		topic.title = validator.escape(topic.title);
 		topic.relativeTime = utils.toISOString(topic.timestamp);
+		topic.lastposttimeISO = utils.toISOString(topic.lastposttime);
 		callback(null, topic);
 	}