diff --git a/app/controllers/documents_controller.rb b/app/controllers/documents_controller.rb
index ab39072..22a5539 100644
--- a/app/controllers/documents_controller.rb
+++ b/app/controllers/documents_controller.rb
@@ -50,7 +50,7 @@ def show
       }
       format.any {
         path = @document.file.path(params[:style] || params[:format])
-        head(:not_found) and return unless File.exist?(path)
+        head(:not_found) and return unless (File.exist?(path) and request.format.nil? == false)
         send_file path,
                  :filename => @document.file_file_name,
                  :disposition => "inline",