diff --git a/core/includes/update.inc b/core/includes/update.inc
index b6d07f4..22baff9 100644
--- a/core/includes/update.inc
+++ b/core/includes/update.inc
@@ -733,7 +733,7 @@ function update_language_list($flags = LanguageInterface::STATE_CONFIGURABLE) {
       // No language module, so use the default language only.
       $languages = array($default->id => $default);
       // Add the special languages, they will be filtered later if needed.
-      $languages += \Drupal::languageManager()->getDefaultLockedLanguages($default->weight);
+      $languages += \Drupal::languageManager()->getDefaultLockedLanguages($default->getWeight());
     }
   }
 
diff --git a/core/lib/Drupal/Core/Language/Language.php b/core/lib/Drupal/Core/Language/Language.php
index b04f60f..0158eb8 100644
--- a/core/lib/Drupal/Core/Language/Language.php
+++ b/core/lib/Drupal/Core/Language/Language.php
@@ -57,7 +57,7 @@ class Language implements LanguageInterface {
    *
    * @var int
    */
-  public $weight = 0;
+  protected $weight = 0;
 
   /**
    * Locked indicates a language used by the system, not an actual language.
diff --git a/core/lib/Drupal/Core/Language/LanguageManager.php b/core/lib/Drupal/Core/Language/LanguageManager.php
index ea7f830..6fe99d6 100644
--- a/core/lib/Drupal/Core/Language/LanguageManager.php
+++ b/core/lib/Drupal/Core/Language/LanguageManager.php
@@ -135,7 +135,7 @@ public function getLanguages($flags = LanguageInterface::STATE_CONFIGURABLE) {
       $default = $this->getDefaultLanguage();
       $this->languages = array($default->id => $default);
       // Add the special languages, they will be filtered later if needed.
-      $this->languages += $this->getDefaultLockedLanguages($default->weight);
+      $this->languages += $this->getDefaultLockedLanguages($default->getWeight());
     }
 
     // Filter the full list of languages based on the value of the $all flag. By
diff --git a/core/modules/language/src/ConfigurableLanguageManager.php b/core/modules/language/src/ConfigurableLanguageManager.php
index 6699ab0..dbb68d2 100644
--- a/core/modules/language/src/ConfigurableLanguageManager.php
+++ b/core/modules/language/src/ConfigurableLanguageManager.php
@@ -298,7 +298,7 @@ public function getLanguages($flags = LanguageInterface::STATE_CONFIGURABLE) {
         $data['default'] = ($langcode == $default->id);
         $data['name'] = $data['label'];
         $this->languages[$langcode] = new Language($data);
-        $weight = max(array($weight, $this->languages[$langcode]->weight));
+        $weight = max(array($weight, $this->languages[$langcode]->getWeight()));
       }
 
       // Add locked languages, they will be filtered later if needed.
@@ -337,8 +337,8 @@ public function updateLockedLanguageWeights() {
 
     // Get maximum weight to update the system languages to keep them on bottom.
     foreach ($this->getLanguages(LanguageInterface::STATE_CONFIGURABLE) as $language) {
-      if (!$language->isLocked() && $language->weight > $max_weight) {
-        $max_weight = $language->weight;
+      if (!$language->isLocked() && $language->getWeight() > $max_weight) {
+        $max_weight = $language->getWeight();
       }
     }
 
diff --git a/core/modules/language/src/Entity/ConfigurableLanguage.php b/core/modules/language/src/Entity/ConfigurableLanguage.php
index 1235b8a..6fcf874 100644
--- a/core/modules/language/src/Entity/ConfigurableLanguage.php
+++ b/core/modules/language/src/Entity/ConfigurableLanguage.php
@@ -71,7 +71,7 @@ class ConfigurableLanguage extends ConfigEntityBase implements ConfigurableLangu
    *
    * @var integer
    */
-  public $weight = 0;
+  protected $weight = 0;
 
   /**
    * Locked languages cannot be edited.
diff --git a/core/modules/language/src/Tests/LanguageConfigurationTest.php b/core/modules/language/src/Tests/LanguageConfigurationTest.php
index d7cc61f..ce8c7cf 100644
--- a/core/modules/language/src/Tests/LanguageConfigurationTest.php
+++ b/core/modules/language/src/Tests/LanguageConfigurationTest.php
@@ -157,7 +157,7 @@ protected function checkConfigurableLanguageWeight($state = 'by default') {
     $replacements = array('@event' => $state);
     foreach (\Drupal::languageManager()->getLanguages(LanguageInterface::STATE_LOCKED) as $locked_language) {
       $replacements['%language'] = $locked_language->name;
-      $this->assertTrue($locked_language->weight > $max_configurable_language_weight, format_string('System language %language has higher weight than configurable languages @event', $replacements));
+      $this->assertTrue($locked_language->getWeight() > $max_configurable_language_weight, format_string('System language %language has higher weight than configurable languages @event', $replacements));
     }
   }
 
@@ -170,10 +170,11 @@ protected function checkConfigurableLanguageWeight($state = 'by default') {
   protected function getHighestConfigurableLanguageWeight(){
     $max_weight = 0;
 
+    /* @var $languages \Drupal\Core\Language\LanguageInterface[] */
     $languages = entity_load_multiple('configurable_language', NULL, TRUE);
     foreach ($languages as $language) {
-      if (!$language->isLocked() && $language->weight > $max_weight) {
-        $max_weight = $language->weight;
+      if (!$language->isLocked() && $language->getWeight() > $max_weight) {
+        $max_weight = $language->getWeight();
       }
     }