diff --git a/app/controllers/favorite_groups_controller.rb b/app/controllers/favorite_groups_controller.rb
index bb59b60b6..c4dcc2c10 100644
--- a/app/controllers/favorite_groups_controller.rb
+++ b/app/controllers/favorite_groups_controller.rb
@@ -74,6 +74,6 @@ class FavoriteGroupsController < ApplicationController
   end
 
   def favgroup_params
-    params.fetch(:favorite_group, {}).permit(%i[name post_ids is_public])
+    params.fetch(:favorite_group, {}).permit(%i[name post_ids is_public], post_id_array: [])
   end
 end
diff --git a/test/functional/favorite_groups_controller_test.rb b/test/functional/favorite_groups_controller_test.rb
index 36a185d57..bbb85e511 100644
--- a/test/functional/favorite_groups_controller_test.rb
+++ b/test/functional/favorite_groups_controller_test.rb
@@ -45,11 +45,13 @@ class FavoriteGroupsControllerTest < ActionDispatch::IntegrationTest
     end
 
     context "update action" do
-      should "render" do
-        params = { favorite_group: { name: "foo" } }
-        put_auth favorite_group_path(@favgroup), @user, params: params
+      should "update posts" do
+        @posts = create_list(:post, 2)
+        put_auth favorite_group_path(@favgroup), @user, params: { favorite_group: { name: "foo", post_id_array: @posts.map(&:id) } }
+
         assert_redirected_to @favgroup
         assert_equal("foo", @favgroup.reload.name)
+        assert_equal(@posts.map(&:id), @favgroup.post_id_array)
       end
     end