diff --git a/public/src/client/world.js b/public/src/client/world.js
index 61492a5d9f..ec2c4ef497 100644
--- a/public/src/client/world.js
+++ b/public/src/client/world.js
@@ -14,7 +14,7 @@ define('forum/world', [
 		quickreply.init({
 			route: '/topics',
 			body: {
-				cid: ajaxify.data.cid,
+				cid: config.activitypub.worldDefaultCid || ajaxify.data.cid,
 			},
 		});
 
diff --git a/src/controllers/api.js b/src/controllers/api.js
index 4fd83dcd5b..ba49ccb29c 100644
--- a/src/controllers/api.js
+++ b/src/controllers/api.js
@@ -103,6 +103,7 @@ apiController.loadConfig = async function (req) {
 		},
 		activitypub: {
 			probe: meta.config.activitypubEnabled && meta.config.activitypubProbe,
+			worldDefaultCid: meta.config.activitypubWorldDefaultCid,
 		},
 	};