diff --git a/commerce_pdm_product_form_reference.js b/commerce_pdm_product_form_reference.js
index 65faa30..cd6a2b2 100644
--- a/commerce_pdm_product_form_reference.js
+++ b/commerce_pdm_product_form_reference.js
@@ -7,11 +7,11 @@ Drupal.behaviors.commerce_pdm_form_commerce_product_ui_product_form_alter = {
       var COMMERCE_PDM_TYPE_MESSAGE_ERROR = 'commercePdmTypeMessageError';
 
       // Declare all used elements as understandable variables.
-      $table = $('table#commerce_pdm_product_referenced_by');
-      $newTitleInput = $table.find('input#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-title');
-      $newTypeSelect = $table.find('select#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-type');
-      $existingNidInput = $table.find('input#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-existing');
-      $addButton = $table.find('a#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-add');
+      var $table = $('table#commerce_pdm_product_referenced_by');
+      var $newTitleInput = $table.find('input#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-title');
+      var $newTypeSelect = $table.find('select#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-type');
+      var $existingNidInput = $table.find('input#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-existing');
+      var $addButton = $table.find('a#edit-quick-reference-add-new-reference-actions-commerce-pdm-product-display-add');
 
       /**
        *
@@ -146,7 +146,7 @@ Drupal.behaviors.commerce_pdm_form_commerce_product_ui_product_form_alter = {
         $new_row.find('input.commerce-pdm-new-reference').val(newType);
 
         $new_row.removeClass('odd').removeClass('even');
-        $alternateRowClass = numRows % 2 ? 'even' : 'odd';
+        var $alternateRowClass = numRows % 2 ? 'even' : 'odd';
         $new_row.addClass($alternateRowClass);
 
         $template.before($new_row);
@@ -170,7 +170,7 @@ Drupal.behaviors.commerce_pdm_form_commerce_product_ui_product_form_alter = {
        * @param {string} messageType
        */
       function displayMessage(msg, messageType) {
-        $messageContainer = $('table#commerce_pdm_product_referenced_by div.commerce-pdm-product-form-reference-error-message');
+        var $messageContainer = $('table#commerce_pdm_product_referenced_by div.commerce-pdm-product-form-reference-error-message');
         $messageContainer.css('color', (messageType === COMMERCE_PDM_TYPE_MESSAGE_INFORMATION) ? 'green' : 'red');
         $messageContainer.text(msg);
         $messageContainer.fadeIn(250).delay(1750).fadeOut(250);