diff --git a/public/javascripts/application.js b/public/javascripts/application.js
index ad7109e..f38b69b 100644
--- a/public/javascripts/application.js
+++ b/public/javascripts/application.js
@@ -665,6 +665,7 @@ function beforeShowDatePicker(input, inst) {
     }, options );
 
     return this.sortable($.extend({
+      axis: 'y',
       handle: ".sort-handle",
       helper: function(event, ui){
         ui.children('td').each(function(){