diff --git a/src/topics/tools.js b/src/topics/tools.js
index 2fdd0d445c..269538599e 100644
--- a/src/topics/tools.js
+++ b/src/topics/tools.js
@@ -93,7 +93,8 @@ module.exports = function (Topics) {
 			throw new Error('[[error:no-privileges]]');
 		}
 		await Topics.setTopicField(tid, 'locked', lock ? 1 : 0);
-		topicData.isLocked = lock;
+		topicData.isLocked = lock; // deprecate in v2.0
+		topicData.locked = lock;
 
 		plugins.fireHook('action:topic.lock', { topic: _.clone(topicData), uid: uid });
 		return topicData;