diff --git a/src/Form/ApproveUserForm.php b/src/Form/ApproveUserForm.php
index f35bc9c..3740e43 100644
--- a/src/Form/ApproveUserForm.php
+++ b/src/Form/ApproveUserForm.php
@@ -66,11 +66,11 @@ class ApproveUserForm extends FormBase
 
 			if($user->save())
 			{
-				drupal_set_message($this->t("%username's account has been activated", array('%username' => $user->getDisplayName())));
+				$this->messenger()->addStatus($this->t("%username's account has been activated", array('%username' => $user->getDisplayName())));
 			}
 			else
 			{
-				drupal_set_message($this->t('Sorry, an unknown error occurred'));
+				$this->messenger()->addStatus($this->t('Sorry, an unknown error occurred'));
 			}
 		}
 	}