diff --git a/lib/helpers/api_helper.dart b/lib/helpers/api_helper.dart
index e706bbf..29d86a9 100644
--- a/lib/helpers/api_helper.dart
+++ b/lib/helpers/api_helper.dart
@@ -115,7 +115,8 @@ class ApiHelper {
       Request(
         "POST",
         Uri.base,
-        body: json.encode({"code": code, "client_id": "proxy"}),
+        body: utf8.encode('code=$code&client_id=proxy'),
+        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
       ),
     );