diff --git a/core/modules/locale/locale.batch.inc b/core/modules/locale/locale.batch.inc
index 13f0cce..fade172 100644
--- a/core/modules/locale/locale.batch.inc
+++ b/core/modules/locale/locale.batch.inc
@@ -302,4 +302,4 @@ function locale_translation_download_source($source_file, $directory = 'temporar
   }
   \Drupal::logger('locale')->error('Unable to download translation file @uri.', ['@uri' => $source_file->uri]);
   return FALSE;
-}
\ No newline at end of file
+}
diff --git a/core/modules/locale/tests/src/Functional/Update/OldPluralUpdateTest.php b/core/modules/locale/tests/src/Functional/Update/OldPluralUpdateTest.php
new file mode 100644
index 0000000..db8067a
--- /dev/null
+++ b/core/modules/locale/tests/src/Functional/Update/OldPluralUpdateTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\Tests\locale\Functional\Update;
+
+use Drupal\Core\StringTranslation\PluralTranslatableMarkup;
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+use Drupal\language\Entity\ConfigurableLanguage;
+
+/**
+ * Tests the update path for the fix old plural.
+ *
+ * @group Update
+ */
+class OldPluralUpdateTest extends UpdatePathTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setDatabaseDumpFiles() {
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-8.filled.standard.php.gz',
+    ];
+  }
+
+  /**
+   * Tests language_post_update_language_select_widget().
+   */
+  public function testOldPluralUpdatePath() {
+    ConfigurableLanguage::createFromLangcode('ru')->save();
+    $storage = \Drupal::service('locale.storage');
+
+    $string = $storage->createString([
+      'source' => "1 old plural test" . PluralTranslatableMarkup::DELIMITER . "@count old plural tests"
+    ])->save();
+
+    $storage->createTranslation([
+      'lid' => $string->lid,
+      'language' => 'ru',
+      'translation' => "test 0" . PluralTranslatableMarkup::DELIMITER . "@count test1" . PluralTranslatableMarkup::DELIMITER . "@count[2] test2",
+    ])->save();
+
+    // Tests before the update.
+    $translation = $storage->getTranslations(['language' => 'ru', 'lid' => $string->lid])[0];
+    $this->assertContains('@count[2]', $translation->getString());
+
+    // Run the update.
+    $this->runUpdates();
+
+    // Tests after the update.
+    $translation = $storage->getTranslations(['language' => 'ru', 'lid' => $string->lid])[0];
+    $this->assertNotContains('@count[2]', $translation->getString());
+  }
+
+}