diff --git a/src/Symfony/Component/Ldap/Security/LdapUser.php b/src/Symfony/Component/Ldap/Security/LdapUser.php
index c8f3972832..f82d44ef88 100644
--- a/src/Symfony/Component/Ldap/Security/LdapUser.php
+++ b/src/Symfony/Component/Ldap/Security/LdapUser.php
@@ -67,6 +67,7 @@ class LdapUser implements UserInterface, EquatableInterface
      */
     public function getSalt(): ?string
     {
+        return null;
     }
 
     /**