diff --git a/Entity/UidUser.php b/Entity/UidUser.php
index a18b814..450b7f1 100644
--- a/Entity/UidUser.php
+++ b/Entity/UidUser.php
@@ -63,7 +63,7 @@ public function getUserIdentifier(): string {
      * This is important if, at any given point, sensitive information like
      * the plain-text password is stored on this object.
      */
-    public function eraseCredentials() {}
+    public function eraseCredentials(): void {}
 
     public function equals(UserInterface $user) {
         if(!$user instanceof UidUser) {