diff --git a/jquery.are-you-sure.js b/jquery.are-you-sure.js
index 3c41e2f..ea62da3 100644
--- a/jquery.are-you-sure.js
+++ b/jquery.are-you-sure.js
@@ -88,7 +88,7 @@
         return;
       }
 
-      $fields = $form.find(settings.fieldSelector);
+      var $fields = $form.find(settings.fieldSelector);
 
       if (settings.addRemoveFieldsMarksDirty) {              
         // Check if field count has changed
@@ -102,7 +102,7 @@
       // Brute force - check each field
       var isDirty = false;
       $fields.each(function() {
-        $field = $(this);
+        var $field = $(this);
         if (isFieldDirty($field)) {
           isDirty = true;
           return false; // break
@@ -156,7 +156,7 @@
     if (!settings.silent && !window.aysUnloadSet) {
       window.aysUnloadSet = true;
       $(window).bind('beforeunload', function() {
-        $dirtyForms = $("form").filter('.' + settings.dirtyClass);
+        var $dirtyForms = $("form").filter('.' + settings.dirtyClass);
         if ($dirtyForms.length == 0) {
           return;
         }