diff --git a/app/helpers/post_versions_helper.rb b/app/helpers/post_versions_helper.rb
index 4a602c949..89fb879c9 100644
--- a/app/helpers/post_versions_helper.rb
+++ b/app/helpers/post_versions_helper.rb
@@ -52,7 +52,7 @@ module PostVersionsHelper
     diff[:removed_locked_tags].each do |tag_name|
       changes << tag.del(link_to("-#{tag_name}", posts_path(tags: tag_name)))
     end
-    diff[:unchanged_locked_tags].each do |tag|
+    diff[:unchanged_locked_tags].each do |tag_name|
       changes << tag.span(link_to(tag_name, posts_path(tags: tag_name)))
     end
 
diff --git a/test/functional/post_versions_controller_test.rb b/test/functional/post_versions_controller_test.rb
index 47ac9abba..f932db112 100644
--- a/test/functional/post_versions_controller_test.rb
+++ b/test/functional/post_versions_controller_test.rb
@@ -13,10 +13,10 @@ class PostVersionsControllerTest < ActionDispatch::IntegrationTest
         as(@user) do
           @post = create(:post)
           travel_to(2.hours.from_now) do
-            @post.update(tag_string: "1 2", source: "xxx")
+            @post.update(tag_string: "1 2", source: "xxx\nyyy", locked_tags: "4 5")
           end
           travel_to(4.hours.from_now) do
-            @post.update(tag_string: "2 3", rating: "e")
+            @post.update(tag_string: "2 3", rating: "e", source: "yyy\nzzz", locked_tags: "5 6")
           end
           @versions = @post.versions
           @post2 = create(:post)