diff --git a/core/modules/system/src/Tests/Update/PathAliasUpdateTest.php b/core/modules/system/src/Tests/Update/PathAliasUpdateTest.php
index 87156bc..d824ff9 100644
--- a/core/modules/system/src/Tests/Update/PathAliasUpdateTest.php
+++ b/core/modules/system/src/Tests/Update/PathAliasUpdateTest.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Language\LanguageInterface;
 
 /**
- * Tests system_update_8012().
+ * Tests system_post_update_path_alias_lowercase().
  *
  * @group Update
  */
@@ -26,7 +26,7 @@ protected function setDatabaseDumpFiles() {
   }
 
   /**
-   * Ensures that the system_update_8012() runs as expected.
+   * Ensures that system_post_update_path_alias_lowercase() runs as expected.
    */
   public function testUpdate() {
     $connection = \Drupal::database();
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index da34040..47f6dca 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1808,37 +1808,5 @@ function system_update_8011() {
 }
 
 /**
- * Load and save all path aliases to make sure they are lower case.
- */
-function system_update_8012(&$sandbox = NULL) {
-  // The path alias storage interface has no way to count or iterate over all
-  // aliases, so we have to fall back to SQL for this function.
-  /** @var \Drupal\Core\Path\AliasStorageInterface $alias_storage */
-  $alias_storage = \Drupal::service('path.alias_storage');
-  $connection = \Drupal::database();
-  $schema = $connection->schema();
-  if ($schema->tableExists('url_alias')) {
-    if (!isset($sandbox['current'])) {
-      $sandbox['current'] = 0;
-      $sandbox['max'] = $connection->query('SELECT COUNT(pid) FROM {url_alias}')
-        ->fetchField();
-    }
-    $aliases = $connection->queryRange('SELECT pid, source, alias, langcode FROM {url_alias} ORDER BY pid ASC', $sandbox['current'], $sandbox['current'] + 50)
-      ->fetchAllAssoc('pid', PDO::FETCH_ASSOC);
-
-    foreach ($aliases as $alias) {
-      $alias_storage->save($alias['source'], $alias['alias'], $alias['langcode'], $alias['pid']);
-      $sandbox['current']++;
-    }
-
-    $sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['current'] / $sandbox['max']);
-    return t('Path aliases converted');
-  }
-  else {
-    return t('Path alias conversion skipped, because the {url_alias} table did not exist.');
-  }
-}
-
-/**
  * @} End of "addtogroup updates-8.0.0-beta".
  */
diff --git a/core/modules/system/system.post_update.php b/core/modules/system/system.post_update.php
index 3a141ce..7dc74df 100644
--- a/core/modules/system/system.post_update.php
+++ b/core/modules/system/system.post_update.php
@@ -31,5 +31,37 @@ function system_post_update_fix_enforced_dependencies() {
 }
 
 /**
+ * Load and save all path aliases to make sure they are lower case.
+ */
+function system_post_update_path_alias_lowercase(&$sandbox = NULL) {
+  // The path alias storage interface has no way to count or iterate over all
+  // aliases, so we have to fall back to SQL for this function.
+  /** @var \Drupal\Core\Path\AliasStorageInterface $alias_storage */
+  $alias_storage = \Drupal::service('path.alias_storage');
+  $connection = \Drupal::database();
+  $schema = $connection->schema();
+  if ($schema->tableExists('url_alias')) {
+    if (!isset($sandbox['current'])) {
+      $sandbox['current'] = 0;
+      $sandbox['max'] = $connection->query('SELECT COUNT(pid) FROM {url_alias}')
+        ->fetchField();
+    }
+    $aliases = $connection->queryRange('SELECT pid, source, alias, langcode FROM {url_alias} ORDER BY pid ASC', $sandbox['current'], $sandbox['current'] + 50)
+      ->fetchAllAssoc('pid', PDO::FETCH_ASSOC);
+
+    foreach ($aliases as $alias) {
+      $alias_storage->save($alias['source'], $alias['alias'], $alias['langcode'], $alias['pid']);
+      $sandbox['current']++;
+    }
+
+    $sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['current'] / $sandbox['max']);
+    return t('Path aliases converted');
+  }
+  else {
+    return t('Path alias conversion skipped, because the {url_alias} table did not exist.');
+  }
+}
+
+/**
  * @} End of "addtogroup updates-8.0.0-beta".
  */