diff --git a/rhodecode/controllers/admin/notifications.py b/rhodecode/controllers/admin/notifications.py
--- a/rhodecode/controllers/admin/notifications.py
+++ b/rhodecode/controllers/admin/notifications.py
@@ -110,8 +110,8 @@ class NotificationsController(BaseContro
         # url('notification', notification_id=ID)
         try:
             no = Notification.get(notification_id)
-            owner = lambda: (no.notifications_to_users.user.user_id
-                             == c.rhodecode_user.user_id)
+            owner = all(un.user.user_id == c.rhodecode_user.user_id
+                        for un in no.notifications_to_users)
             if h.HasPermissionAny('hg.admin')() or owner:
                     NotificationModel().mark_read(c.rhodecode_user.user_id, no)
                     Session().commit()
@@ -132,8 +132,8 @@ class NotificationsController(BaseContro
 
         try:
             no = Notification.get(notification_id)
-            owner = lambda: (no.notifications_to_users.user.user_id
-                             == c.rhodecode_user.user_id)
+            owner = all(un.user.user_id == c.rhodecode_user.user_id
+                        for un in no.notifications_to_users)
             if h.HasPermissionAny('hg.admin')() or owner:
                     NotificationModel().delete(c.rhodecode_user.user_id, no)
                     Session().commit()
@@ -149,8 +149,8 @@ class NotificationsController(BaseContro
         c.user = self.rhodecode_user
         no = Notification.get(notification_id)
 
-        owner = lambda: (no.notifications_to_users.user.user_id
-                         == c.user.user_id)
+        owner = all(un.user.user_id == c.rhodecode_user.user_id
+                    for un in no.notifications_to_users)
         if no and (h.HasPermissionAny('hg.admin', 'repository.admin')() or owner):
             unotification = NotificationModel()\
                             .get_user_notification(c.user.user_id, no)
diff --git a/rhodecode/controllers/changeset.py b/rhodecode/controllers/changeset.py
--- a/rhodecode/controllers/changeset.py
+++ b/rhodecode/controllers/changeset.py
@@ -371,7 +371,7 @@ class ChangesetController(BaseRepoContro
     @jsonify
     def delete_comment(self, repo_name, comment_id):
         co = ChangesetComment.get(comment_id)
-        owner = lambda: co.author.user_id == c.rhodecode_user.user_id
+        owner = co.author.user_id == c.rhodecode_user.user_id
         if h.HasPermissionAny('hg.admin', 'repository.admin')() or owner:
             ChangesetCommentsModel().delete(comment=co)
             Session().commit()
diff --git a/rhodecode/controllers/pullrequests.py b/rhodecode/controllers/pullrequests.py
--- a/rhodecode/controllers/pullrequests.py
+++ b/rhodecode/controllers/pullrequests.py
@@ -477,7 +477,7 @@ class PullrequestsController(BaseRepoCon
             #don't allow deleting comments on closed pull request
             raise HTTPForbidden()
 
-        owner = lambda: co.author.user_id == c.rhodecode_user.user_id
+        owner = co.author.user_id == c.rhodecode_user.user_id
         if h.HasPermissionAny('hg.admin', 'repository.admin')() or owner:
             ChangesetCommentsModel().delete(comment=co)
             Session().commit()
diff --git a/rhodecode/tests/functional/test_admin_notifications.py b/rhodecode/tests/functional/test_admin_notifications.py
--- a/rhodecode/tests/functional/test_admin_notifications.py
+++ b/rhodecode/tests/functional/test_admin_notifications.py
@@ -82,6 +82,7 @@ class TestNotificationsController(TestCo
         response = self.app.delete(url('notification',
                                        notification_id=
                                        notification.notification_id))
+        self.assertEqual(response.body, 'ok')
 
         cur_user = User.get(cur_usr_id)
         self.assertEqual(cur_user.notifications, [])