diff --git a/core/config/schema/core.data_types.schema.yml b/core/config/schema/core.data_types.schema.yml
index 33369bd..4356141 100644
--- a/core/config/schema/core.data_types.schema.yml
+++ b/core/config/schema/core.data_types.schema.yml
@@ -374,6 +374,11 @@ field_config_base:
       label: 'Default value function'
     settings:
       type: field.[%parent.field_type].instance_settings
+    third_party_settings:
+      type: sequence
+      label: 'Third party settings'
+      sequence:
+        - type: field_config.third_party.[%key]
     field_type:
       type: string
       label: 'Field type'
diff --git a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
index 536a4cb..0836eaf 100644
--- a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
+++ b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
@@ -80,11 +80,6 @@ protected function checkValue($key, $value) {
     $error_key = $this->configName . ':' . $key;
     $element = $this->schema->get($key);
     if ($element instanceof Undefined) {
-      // @todo Temporary workaround for https://www.drupal.org/node/2224761.
-      $key_parts = explode('.', $key);
-      if (array_pop($key_parts) == 'translation_sync' && strpos($this->configName, 'field.') === 0) {
-        return array();
-      }
       return array($error_key => 'Missing schema.');
     }
 
diff --git a/core/lib/Drupal/Core/Field/FieldConfigInterface.php b/core/lib/Drupal/Core/Field/FieldConfigInterface.php
index 1207356..68bdb70 100644
--- a/core/lib/Drupal/Core/Field/FieldConfigInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldConfigInterface.php
@@ -72,4 +72,18 @@ public function targetBundle();
    */
   public function setDefaultValue($value);
 
+  /**
+   * Sets the value of a third-party setting for the plugin.
+   *
+   * @param string $module
+   *   The module providing the third-party setting.
+   * @param string $key
+   *   The setting name.
+   * @param mixed $value
+   *   The setting value.
+   *
+   * @return $this
+   */
+  public function setThirdPartySetting($module, $key, $value);
+
 }
diff --git a/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php b/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
index 2236d59..5cf45fa 100644
--- a/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldDefinitionInterface.php
@@ -193,4 +193,21 @@ public function getFieldStorageDefinition();
    */
   public function getConfig($bundle);
 
+  /**
+   * Returns the value of a third-party setting, or $default if not set.
+   *
+   * @param string $module
+   *   The module providing the third-party setting.
+   * @param string $key
+   *   The setting name.
+   * @param mixed $default
+   *   (optional) The default value if the third party setting is not set.
+   *   Defaults to NULL.
+   *
+   * @return mixed|NULL
+   *   The setting value. Returns NULL if the setting does not exist and
+   *   $default is not provided.
+   */
+  public function getThirdPartySetting($module, $key, $default = NULL);
+
 }
diff --git a/core/modules/content_translation/config/schema/content_translation.schema.yml b/core/modules/content_translation/config/schema/content_translation.schema.yml
new file mode 100644
index 0000000..3037e8a
--- /dev/null
+++ b/core/modules/content_translation/config/schema/content_translation.schema.yml
@@ -0,0 +1,9 @@
+# Schema for the Content Translation module.
+
+field_config.third_party.content_translation:
+  type: mapping
+  label: 'Content translation field settings'
+  mapping:
+    translation_sync:
+      type: sequence
+      label: 'Field properties for which to synchronize translations'
diff --git a/core/modules/content_translation/content_translation.admin.inc b/core/modules/content_translation/content_translation.admin.inc
index 768b891..d808768 100644
--- a/core/modules/content_translation/content_translation.admin.inc
+++ b/core/modules/content_translation/content_translation.admin.inc
@@ -38,12 +38,11 @@ function content_translation_field_sync_widget(FieldDefinitionInterface $field)
 
     $settings = array('dependent_selectors' => array('instance[settings][translation_sync]' => array('file')));
 
-    $translation_sync = $field->getSetting('translation_sync');
     $element = array(
       '#type' => 'checkboxes',
       '#title' => t('Translatable elements'),
       '#options' => $options,
-      '#default_value' => !empty($translation_sync) ? $translation_sync : $default,
+      '#default_value' => $field->getThirdPartySetting('content_translation', 'translation_sync', $default),
       '#attached' => array(
         'library' => array(
           'content_translation/drupal.content_translation.admin',
diff --git a/core/modules/content_translation/content_translation.install b/core/modules/content_translation/content_translation.install
index 06a355b..4aa7e73 100644
--- a/core/modules/content_translation/content_translation.install
+++ b/core/modules/content_translation/content_translation.install
@@ -88,19 +88,6 @@ function content_translation_install() {
   // hook_module_implements_alter() is run among the last ones.
   module_set_weight('content_translation', 10);
   \Drupal::service('language_negotiator')->saveConfiguration(LanguageInterface::TYPE_CONTENT, array(LanguageNegotiationUrl::METHOD_ID => 0));
-
-  $config_names = \Drupal::configFactory()->listAll(\Drupal::entityManager()->getDefinition('field_storage_config')->getConfigPrefix() . '.');
-  foreach ($config_names as $name) {
-    \Drupal::config($name)
-      ->set('settings.translation_sync', FALSE)
-      ->save();
-  }
-  $config_names = \Drupal::configFactory()->listAll('field.instance.');
-  foreach ($config_names as $name) {
-    \Drupal::config($name)
-      ->set('settings.translation_sync', FALSE)
-      ->save();
-  }
 }
 
 /**
@@ -118,21 +105,3 @@ function content_translation_enable() {
   $message = t('<a href="!settings_url">Enable translation</a> for <em>content types</em>, <em>taxonomy vocabularies</em>, <em>accounts</em>, or any other element you wish to translate.', $t_args);
   drupal_set_message($message, 'warning');
 }
-
-/**
- * Implements hook_uninstall().
- */
-function content_translation_uninstall() {
-  $config_names = \Drupal::configFactory()->listAll(\Drupal::entityManager()->getDefinition('field_storage_config')->getConfigPrefix() . '.');
-  foreach ($config_names as $name) {
-    \Drupal::config($name)
-      ->clear('settings.translation_sync')
-      ->save();
-  }
-  $config_names = \Drupal::configFactory()->listAll('field.instance.');
-  foreach ($config_names as $name) {
-    \Drupal::config($name)
-      ->clear('settings.translation_sync')
-      ->save();
-  }
-}
diff --git a/core/modules/content_translation/content_translation.module b/core/modules/content_translation/content_translation.module
index d8b2819..de2d11d 100644
--- a/core/modules/content_translation/content_translation.module
+++ b/core/modules/content_translation/content_translation.module
@@ -652,16 +652,6 @@ function content_translation_form_field_ui_field_instance_edit_form_alter(array
  * Implements hook_entity_presave().
  */
 function content_translation_entity_presave(EntityInterface $entity) {
-  // By default no column has to be synchronized.
-  // @todo Replace with own storage in https://drupal.org/node/2224761
-  if ($entity->getEntityTypeId() === 'field_storage_config') {
-    $entity->settings += array('translation_sync' => FALSE);
-  }
-  // Synchronization can be enabled per instance.
-  // @todo Replace with own storage in https://drupal.org/node/2224761
-  if ($entity->getEntityTypeId() === 'field_instance_config') {
-    $entity->settings += array('translation_sync' => FALSE);
-  }
   if ($entity instanceof ContentEntityInterface && $entity->isTranslatable()) {
     // @todo Avoid using request attributes once translation metadata become
     //   regular fields.
diff --git a/core/modules/content_translation/src/FieldTranslationSynchronizer.php b/core/modules/content_translation/src/FieldTranslationSynchronizer.php
index 196512b..3e03940 100644
--- a/core/modules/content_translation/src/FieldTranslationSynchronizer.php
+++ b/core/modules/content_translation/src/FieldTranslationSynchronizer.php
@@ -54,6 +54,7 @@ public function synchronizeFields(ContentEntityInterface $entity, $sync_langcode
       return;
     }
 
+    /** @var \Drupal\Core\Field\FieldItemListInterface $items */
     foreach ($entity as $field_name => $items) {
       $field_definition = $items->getFieldDefinition();
       $field_type_definition = $field_type_manager->getDefinition($field_definition->getType());
@@ -61,7 +62,7 @@ public function synchronizeFields(ContentEntityInterface $entity, $sync_langcode
 
       // Sync if the field is translatable, not empty, and the synchronization
       // setting is enabled.
-      if ($field_definition->isTranslatable() && !$items->isEmpty() && $translation_sync = $field_definition->getSetting('translation_sync')) {
+      if ($field_definition->isTranslatable() && !$items->isEmpty() && $translation_sync = $field_definition->getThirdPartySetting('content_translation', 'translation_sync')) {
         // Retrieve all the untranslatable column groups and merge them into
         // single list.
         $groups = array_keys(array_diff($translation_sync, array_filter($translation_sync)));
diff --git a/core/modules/content_translation/src/FieldTranslationSynchronizerInterface.php b/core/modules/content_translation/src/FieldTranslationSynchronizerInterface.php
index 0c60b18..0a5f38a 100644
--- a/core/modules/content_translation/src/FieldTranslationSynchronizerInterface.php
+++ b/core/modules/content_translation/src/FieldTranslationSynchronizerInterface.php
@@ -20,7 +20,8 @@
    * Field column synchronization takes care of propagating any change in the
    * field items order and in the column values themselves to all the available
    * translations. This functionality is provided by defining a
-   * 'translation_sync' key in the field instance settings, holding an array of
+   * 'translation_sync' key for the 'content_translation' module's portion of
+   * the field definition's 'third_party_settings', holding an array of
    * column names to be synchronized. The synchronized column values are shared
    * across translations, while the rest varies per-language. This is useful for
    * instance to translate the "alt" and "title" textual elements of an image
diff --git a/core/modules/content_translation/src/Tests/ContentTranslationSyncImageTest.php b/core/modules/content_translation/src/Tests/ContentTranslationSyncImageTest.php
index 98b9540..6a8c499 100644
--- a/core/modules/content_translation/src/Tests/ContentTranslationSyncImageTest.php
+++ b/core/modules/content_translation/src/Tests/ContentTranslationSyncImageTest.php
@@ -62,11 +62,13 @@ protected function setupTestFields() {
       'field_name' => $this->fieldName,
       'bundle' => $this->entityTypeId,
       'label' => 'Test translatable image field',
-      'settings' => array(
-        'translation_sync' => array(
-          'file' => FALSE,
-          'alt' => 'alt',
-          'title' => 'title',
+      'third_party_settings' => array(
+        'content_translation' => array(
+          'translation_sync' => array(
+            'file' => FALSE,
+            'alt' => 'alt',
+            'title' => 'title',
+          ),
         ),
       ),
     ))->save();