diff --git a/src/Symfony/Component/Ldap/Security/LdapUser.php b/src/Symfony/Component/Ldap/Security/LdapUser.php
index 86d6b0c4ad19c..5ae9818226e14 100644
--- a/src/Symfony/Component/Ldap/Security/LdapUser.php
+++ b/src/Symfony/Component/Ldap/Security/LdapUser.php
@@ -121,7 +121,7 @@ public function isEqualTo(UserInterface $user): bool
             return false;
         }
 
-        if ($this->getUsername() !== $user->getUsername()) {
+        if ($this->getUserIdentifier() !== $user->getUserIdentifier()) {
             return false;
         }