diff --git a/app/activitypub/routes.py b/app/activitypub/routes.py
index e4222c02..9cdf0391 100644
--- a/app/activitypub/routes.py
+++ b/app/activitypub/routes.py
@@ -947,6 +947,22 @@ def process_inbox_request(request_json, store_ap_json):
                     log_incoming_ap(request_json['id'], APLOG_REPORT, APLOG_IGNORED, request_json if store_ap_json else None, 'Report ignored due to missing content')
                 return
 
+            if request_json['object']['type'] == 'Lock':                                                            # Announce of post lock
+                mod = user
+                post_id = request_json['object']['object']
+                post = Post.query.filter_by(ap_id=post_id).first()
+                if post:
+                    if post.community.is_moderator(mod) or post.community.is_instance_admin(mod):
+                        post.comments_enabled = False
+                        db.session.commit()
+                        log_incoming_ap(request_json['id'], APLOG_LOCK, APLOG_SUCCESS, request_json if store_ap_json else None)
+                    else:
+                        log_incoming_ap(request_json['id'], APLOG_LOCK, APLOG_FAILURE, request_json if store_ap_json else None, 'Lock: Does not have permission')
+                else:
+                    log_incoming_ap(request_json['id'], APLOG_LOCK, APLOG_FAILURE, request_json if store_ap_json else None, 'Lock: post not found')
+                return
+
+
 
         # -- below this point is code that will be incrementally replaced to use log_incoming_ap() instead --