diff --git a/src/Controllers/OAuthController.php b/src/Controllers/OAuthController.php
index a3f7543a..fd83688a 100644
--- a/src/Controllers/OAuthController.php
+++ b/src/Controllers/OAuthController.php
@@ -138,7 +138,7 @@ class OAuthController extends BaseController
             ->where('identifier', $resourceId)
             ->get()
             // Explicit case sensitive comparison using PHP as some DBMS collations are case sensitive and some arent
-            ->where('identifier', '===', $resourceId)
+            ->where('identifier', '===', (string)$resourceId)
             ->first();
 
         $expirationTime = $accessToken->getExpires();