diff --git a/captcha.inc b/captcha.inc
index 86b6a00..f19cef4 100644
--- a/captcha.inc
+++ b/captcha.inc
@@ -109,7 +109,7 @@ function _captcha_generate_captcha_session($form_id=NULL, $status=CAPTCHA_STATUS
   // Insert an entry and thankfully receive the value of the autoincrement field 'csid'.
   $captcha_sid = db_insert('captcha_sessions')
   ->fields(array(
-    'uid' => $user->uid,
+    'uid' => $user->id(),
     'sid' => session_id(),
     'ip_address' => Drupal::request()->getClientIp(),
     'timestamp' => REQUEST_TIME,