diff --git a/core/modules/config_translation/src/FormElement/ListElement.php b/core/modules/config_translation/src/FormElement/ListElement.php
index 8bd8a52..9365fc2 100644
--- a/core/modules/config_translation/src/FormElement/ListElement.php
+++ b/core/modules/config_translation/src/FormElement/ListElement.php
@@ -54,8 +54,7 @@ public function getTranslationBuild(LanguageInterface $source_language, Language
     $build = array();
     foreach ($this->element as $key => $element) {
       $sub_build = array();
-      // Make the specific element key, "$base_key.$key".
-      $element_key = implode('.', array_filter(array($base_key, $key)));
+      $element_key = isset($base_key) ? "$base_key.$key" : $key;
       $definition = $element->getDataDefinition();
 
       if ($form_element = ConfigTranslationFormBase::createFormElement($element)) {
@@ -88,7 +87,7 @@ public function getTranslationBuild(LanguageInterface $source_language, Language
    */
   public function setConfig(Config $base_config, LanguageConfigOverride $config_translation, $config_values, $base_key = NULL) {
     foreach ($this->element as $key => $element) {
-      $element_key = implode('.', array_filter(array($base_key, $key)));
+      $element_key = isset($base_key) ? "$base_key.$key" : $key;
       if ($form_element = ConfigTranslationFormBase::createFormElement($element)) {
         // Traverse into the next level of the configuration.
         $value = isset($config_values[$key]) ? $config_values[$key] : NULL;
diff --git a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
index 8671c3c..ae0d250 100644
--- a/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
+++ b/core/modules/config_translation/src/Tests/ConfigTranslationUiTest.php
@@ -703,6 +703,46 @@ public function testAlterInfo() {
   }
 
   /**
+   * Tests the sequence data type translation.
+   */
+  public function testSequenceTranslation() {
+    $this->drupalLogin($this->adminUser);
+    /** @var \Drupal\Core\Config\ConfigFactoryInterface $config_factory */
+    $config_factory = $this->container->get('config.factory');
+
+    $expected = array(
+      'kitten',
+      'llama',
+      'elephant'
+    );
+    $actual = $config_factory
+      ->getEditable('config_translation_test.content')
+      ->get('animals');
+    $this->assertEqual($expected, $actual);
+
+    $edit = array(
+      'translation[config_names][config_translation_test.content][content][value]' => '<p><strong>Hello World</strong> - FR</p>',
+      'translation[config_names][config_translation_test.content][animals][0]' => 'kitten - FR',
+      'translation[config_names][config_translation_test.content][animals][1]' => 'llama - FR',
+      'translation[config_names][config_translation_test.content][animals][2]' => 'elephant - FR',
+    );
+    $this->drupalPostForm('admin/config/media/file-system/translate/fr/add', $edit, t('Save translation'));
+
+    $this->container->get('language.config_factory_override')
+      ->setLanguage(new Language(array('id' => 'fr')));
+
+    $expected = array(
+      'kitten - FR',
+      'llama - FR',
+      'elephant - FR',
+    );
+    $actual = $config_factory
+      ->get('config_translation_test.content')
+      ->get('animals');
+    $this->assertEqual($expected, $actual);
+  }
+
+  /**
    * Test text_format translation.
    */
   public function testTextFormatTranslation() {
diff --git a/core/modules/config_translation/tests/modules/config_translation_test/config/install/config_translation_test.content.yml b/core/modules/config_translation/tests/modules/config_translation_test/config/install/config_translation_test.content.yml
index 5a4d4bb..307db48 100644
--- a/core/modules/config_translation/tests/modules/config_translation_test/config/install/config_translation_test.content.yml
+++ b/core/modules/config_translation/tests/modules/config_translation_test/config/install/config_translation_test.content.yml
@@ -4,3 +4,7 @@ langcode: en
 content:
   value: "<p><strong>Hello World</strong></p>"
   format: plain_text
+animals:
+  - kitten
+  - llama
+  - elephant
diff --git a/core/modules/config_translation/tests/modules/config_translation_test/config/schema/config_translation_test.schema.yml b/core/modules/config_translation/tests/modules/config_translation_test/config/schema/config_translation_test.schema.yml
index 757448f..4e43d5f 100644
--- a/core/modules/config_translation/tests/modules/config_translation_test/config/schema/config_translation_test.schema.yml
+++ b/core/modules/config_translation/tests/modules/config_translation_test/config/schema/config_translation_test.schema.yml
@@ -16,3 +16,9 @@ config_translation_test.content:
     content:
       type: text_format
       label: 'Content'
+    animals:
+      type: sequence
+      label: 'Animals'
+      sequence:
+        - type: label
+