diff --git a/app/controllers/tags_controller.rb b/app/controllers/tags_controller.rb
index d8c4a206e75a253453a116495d75026bc52fe935..f1e6dac20a06345642f6d5b5e0b0f7e923afe973 100644
--- a/app/controllers/tags_controller.rb
+++ b/app/controllers/tags_controller.rb
@@ -82,7 +82,7 @@ class TagsController < ApplicationController
     return unless check_your_privilege('edit_tags', nil, true)
 
     wiki_md = params[:tag][:wiki_markdown]
-    if @tag.update(tag_params.merge(wiki: wiki_md.present? ? helpers.render_markdown(wiki_md) : nil))
+    if @tag.update(tag_params.merge(wiki: wiki_md.present? ? helpers.render_markdown(wiki_md) : nil).except(:name))
       redirect_to tag_path(id: @category.id, tag_id: @tag.id)
     else
       render :edit, status: :bad_request