diff --git a/app/init/resources.php b/app/init/resources.php
index bb1183bd52..180e256870 100644
--- a/app/init/resources.php
+++ b/app/init/resources.php
@@ -815,7 +815,7 @@ App::setResource('devKey', function (Request $request, Document $project, array
 
     // add sdk to key
     $sdkValidator = new WhiteList($servers, true);
-    $sdk = $request->getHeader('x-sdk-name', 'UNKNOWN');
+    $sdk = \strtolower($request->getHeader('x-sdk-name', 'UNKNOWN'));
 
     if ($sdk !== 'UNKNOWN' && $sdkValidator->isValid($sdk)) {
         $sdks = $key->getAttribute('sdks', []);