diff --git a/src/League/OAuth2/Server/Grant/AuthCode.php b/src/League/OAuth2/Server/Grant/AuthCode.php
index b4d7cbde..70447a41 100644
--- a/src/League/OAuth2/Server/Grant/AuthCode.php
+++ b/src/League/OAuth2/Server/Grant/AuthCode.php
@@ -200,7 +200,7 @@ class AuthCode implements GrantTypeInterface {
         $this->authServer->getStorage('session')->associateRedirectUri($sessionId, $authParams['redirect_uri']);
 
         // Associate the auth code
-        $authCodeId = $this->authServer->getStorage('session')->associateAuthCode($sessionId, $authCode, time() + $this->authTokenTTL, implode(',', $scopeIds));
+        $authCodeId = $this->authServer->getStorage('session')->associateAuthCode($sessionId, $authCode, time() + $this->authTokenTTL);
 
         // Associate the scopes to the auth code
         foreach ($authParams['scopes'] as $scope) {