diff --git a/src/PlagScan/Helper/Base.php b/src/PlagScan/Helper/Base.php
index 994ad21e8c5abf3521c55c124d28ad27a18904df..7fcdda01c4bbaeb7969757714329ea62a270b452 100644
--- a/src/PlagScan/Helper/Base.php
+++ b/src/PlagScan/Helper/Base.php
@@ -68,7 +68,7 @@ class Base
             'POST',
             '',
             [
-                'clientID' => $client_id,
+                'client_id' => $client_id,
                 'client_secret' => $client_secret
             ]
         );