diff --git a/app/helpers/gantt_helper.rb b/app/helpers/gantt_helper.rb
index 68ba6d07f..e0a7095b8 100644
--- a/app/helpers/gantt_helper.rb
+++ b/app/helpers/gantt_helper.rb
@@ -23,18 +23,20 @@ module GanttHelper
     case in_or_out
     when :in
       if gantt.zoom < 4
-        link_to l(:text_zoom_in),
+        link_to(
+          l(:text_zoom_in),
           {:params => request.query_parameters.merge(gantt.params.merge(:zoom => (gantt.zoom + 1)))},
-          :class => 'icon icon-zoom-in'
+          :class => 'icon icon-zoom-in')
       else
         content_tag(:span, l(:text_zoom_in), :class => 'icon icon-zoom-in').html_safe
       end
 
     when :out
       if gantt.zoom > 1
-        link_to l(:text_zoom_out),
+        link_to(
+          l(:text_zoom_out),
           {:params => request.query_parameters.merge(gantt.params.merge(:zoom => (gantt.zoom - 1)))},
-          :class => 'icon icon-zoom-out'
+          :class => 'icon icon-zoom-out')
       else
         content_tag(:span, l(:text_zoom_out), :class => 'icon icon-zoom-out').html_safe
       end