diff --git a/app/logical/post_sets/post.rb b/app/logical/post_sets/post.rb
index 68b291a56..ef97af9ed 100644
--- a/app/logical/post_sets/post.rb
+++ b/app/logical/post_sets/post.rb
@@ -18,7 +18,7 @@ module PostSets
     end
     
     def has_wiki?
-      tag_array.any? && ::WikiPage.titled(tag_string).exists?
+      tag_array.size == 1 && ::WikiPage.titled(tag_string).exists?
     end
 
     def wiki_page
diff --git a/app/views/posts/index.html.erb b/app/views/posts/index.html.erb
index 8c74db2ae..6f4bbfea1 100644
--- a/app/views/posts/index.html.erb
+++ b/app/views/posts/index.html.erb
@@ -20,7 +20,7 @@
       <menu id="post-sections">
         <li class="active"><a href="#posts" id="show-posts-link">Posts</a></li>
         
-        <% if params[:tags].present? %>
+        <% if @post_set.has_wiki? %>
           <li><a href="#wiki-except" id="show-wiki-excerpt-link">Wiki</a></li>
         <% end %>
       </menu>