diff --git a/static/js/message_list_view.js b/static/js/message_list_view.js
index 68ebcf6476..bf4dba9ff0 100644
--- a/static/js/message_list_view.js
+++ b/static/js/message_list_view.js
@@ -48,7 +48,7 @@ function get_user_group_id_for_mention_button(elem) {
     const user_group_id = $(elem).attr('data-user-group-id');
 
     if (user_group_id) {
-        return user_group_id;
+        return parseInt(user_group_id, 10);
     }
 
     return;
diff --git a/static/js/settings_user_groups.js b/static/js/settings_user_groups.js
index b03e59625e..2895916ba0 100644
--- a/static/js/settings_user_groups.js
+++ b/static/js/settings_user_groups.js
@@ -298,7 +298,7 @@ exports.set_up = function () {
     });
 
     $('#user-groups').on('click', '.delete', function () {
-        const group_id = $(this).parents('.user-group').attr('id');
+        const group_id = parseInt($(this).parents('.user-group').attr('id'), 10);
         if (!exports.can_edit(group_id)) {
             return;
         }