diff --git a/src/threadTools.js b/src/threadTools.js
index 5125eaf6a4..fa34bef729 100644
--- a/src/threadTools.js
+++ b/src/threadTools.js
@@ -189,14 +189,15 @@ var winston = require('winston'),
 		var topic;
 		async.waterfall([
 			function(next) {
-				topics.getTopicFields(tid, ['cid', 'lastposttime', 'deleted'], next);
+				topics.getTopicFields(tid, ['cid', 'lastposttime', 'pinned', 'deleted'], next);
 			},
 			function(topicData, next) {
 				topic = topicData;
 				db.sortedSetRemove('categories:' + topicData.cid + ':tid', tid, next);
 			},
 			function(result, next) {
-				db.sortedSetAdd('categories:' + cid + ':tid', topic.lastposttime, tid, next);
+				var timestamp = parseInt(topic.pinned, 10) ? Math.pow(2, 53) : topic.lastposttime;
+				db.sortedSetAdd('categories:' + cid + ':tid', timestamp, tid, next);
 			}
 		], function(err, result) {
 			if(err) {