diff --git a/src/Controller.php b/src/Controller.php
index 360423636..ce69a21fc 100644
--- a/src/Controller.php
+++ b/src/Controller.php
@@ -42,7 +42,7 @@ public function index(HTTPRequest $request)
             $rawBody = $request->getBody();
             $data = json_decode($rawBody ?: '', true);
             $query = isset($data['query']) ? $data['query'] : null;
-            $variables = isset($data['variables']) ? $data['variables'] : null;
+            $variables = isset($data['variables']) ? json_decode($data['variables']) : null;
         } else {
             $query = $request->requestVar('query');
             $variables = json_decode($request->requestVar('variables'), true);