diff -u b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/i18nVariable.php b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/i18nVariable.php
--- b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/i18nVariable.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/source/d6/i18nVariable.php
@@ -49,20 +49,20 @@
    * @return array
    *   An associative array where the keys are the variables specified in the
    *   plugin configuration and the values are the values found in the source.
-   *   A key/value pair is added for the language code.  Only those values are
+   *   A key/value pair is added for the language code. Only those values are
    *   returned that are actually in the database.
    */
   protected function values() {
     $values = [];
     $result = $this->prepareQuery()->execute()->FetchAllAssoc('language');
-    foreach ($result as $i18nvariable) {
-      $values[]['language'] = $i18nvariable->language;
+    foreach ($result as $i18n_variable) {
+      $values[]['language'] = $i18n_variable->language;
     }
     $result = $this->prepareQuery()->execute()->FetchAll();
-    foreach ($result as $i18nvariable) {
+    foreach ($result as $i18n_variable) {
       foreach ($values as $key => $value) {
-        if ($values[$key]['language'] === $i18nvariable->language ) {
-          $values[$key][$i18nvariable->name] = unserialize($i18nvariable->value);
+        if ($values[$key]['language'] === $i18n_variable->language) {
+          $values[$key][$i18n_variable->name] = unserialize($i18n_variable->value);
           break;
         }
       }