diff --git a/src/topics/data.js b/src/topics/data.js
index 720d2e63ad..f518a5f5c0 100644
--- a/src/topics/data.js
+++ b/src/topics/data.js
@@ -11,7 +11,7 @@ const plugins = require('../plugins');
 const intFields = [
 	'tid', 'cid', 'uid', 'mainPid', 'postcount',
 	'viewcount', 'postercount', 'deleted', 'locked', 'pinned',
-	'timestamp', 'upvotes', 'downvotes', 'lastposttime',
+	'pinExpiry', 'timestamp', 'upvotes', 'downvotes', 'lastposttime',
 	'deleterUid',
 ];
 
@@ -110,6 +110,10 @@ function modifyTopic(topic, fields) {
 		topic.lastposttimeISO = utils.toISOString(topic.lastposttime);
 	}
 
+	if (topic.hasOwnProperty('pinExpiry')) {
+		topic.pinExpiryISO = utils.toISOString(topic.pinExpiry);
+	}
+
 	if (topic.hasOwnProperty('upvotes') && topic.hasOwnProperty('downvotes')) {
 		topic.votes = topic.upvotes - topic.downvotes;
 	}