diff --git a/app/views/tags/edit.html.erb b/app/views/tags/edit.html.erb
index 6af820a27..6ae686874 100644
--- a/app/views/tags/edit.html.erb
+++ b/app/views/tags/edit.html.erb
@@ -3,7 +3,9 @@
     <h1>Tag: <%= @tag.name %></h1>
 
     <%= simple_form_for(@tag) do |f| %>
-      <%= f.input :category, :collection => Danbooru.config.canonical_tag_category_mapping.to_a, :include_blank => false %>
+      <% unless @tag.is_locked? %>
+        <%= f.input :category, :collection => Danbooru.config.canonical_tag_category_mapping.to_a, :include_blank => false %>
+      <% end %>
 
       <% if CurrentUser.user.is_janitor? %>
         <%= f.input :is_locked, :collection => [["No", "false"], ["Yes", "true"]] %>