diff --git a/lib/gollum/markup.rb b/lib/gollum/markup.rb
index 049730af..ba1d1969 100644
--- a/lib/gollum/markup.rb
+++ b/lib/gollum/markup.rb
@@ -98,7 +98,7 @@ module Gollum
     def process_tex(data)
       @texmap.each do |id, spec|
         type, tex = *spec
-        out = %{<img src="/_tex.png?type=#{type}&data=#{Base64.encode64(tex).chomp}" alt="#{CGI.escapeHTML(tex)}">}
+        out = %{<img src="#{::File.join(@wiki.base_path, '_tex.png')}?type=#{type}&data=#{Base64.encode64(tex).chomp}" alt="#{CGI.escapeHTML(tex)}">}
         data.gsub!(id, out)
       end
       data