diff --git a/src/Grant/AbstractGrant.php b/src/Grant/AbstractGrant.php
index 0b3aeba87..c77330e26 100644
--- a/src/Grant/AbstractGrant.php
+++ b/src/Grant/AbstractGrant.php
@@ -454,7 +454,7 @@ protected function issueAccessToken(
         $accessToken->setExpiryDateTime((new DateTimeImmutable())->add($accessTokenTTL));
         $accessToken->setPrivateKey($this->privateKey);
 
-        if (method_exists($accessToken, 'addClaim')) {
+        if (\method_exists($accessToken, 'addClaim')) {
             foreach ($claims as $claim) {
                 $accessToken->addClaim($claim);
             }