diff --git a/core/lib/Drupal.php b/core/lib/Drupal.php
index ef3fdee..4606277 100644
--- a/core/lib/Drupal.php
+++ b/core/lib/Drupal.php
@@ -247,6 +247,15 @@ public static function currentUser() {
   }
 
   /**
+   * Gets the uid from the current active user.
+   *
+   * @return \Drupal\Core\Session\AccountProxyInterface
+   */
+  public static function getCurrentUserId() {
+    return static::getContainer()->get('current_user')->id();
+  }
+
+  /**
    * Retrieves the entity manager service.
    *
    * @return \Drupal\Core\Entity\EntityManagerInterface
diff --git a/core/modules/file/src/Entity/File.php b/core/modules/file/src/Entity/File.php
index 8a5bd42..b31b20c 100644
--- a/core/modules/file/src/Entity/File.php
+++ b/core/modules/file/src/Entity/File.php
@@ -242,6 +242,7 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['uid'] = BaseFieldDefinition::create('entity_reference')
       ->setLabel(t('User ID'))
       ->setDescription(t('The user ID of the file.'))
+      ->setDefaultValueCallback('Drupal::getCurrentUserId')
       ->setSetting('target_type', 'user');
 
     $fields['filename'] = BaseFieldDefinition::create('string')