diff --git a/app/controllers/api/graphql.php b/app/controllers/api/graphql.php
index 4b424e8c1a..622b861b90 100644
--- a/app/controllers/api/graphql.php
+++ b/app/controllers/api/graphql.php
@@ -27,7 +27,7 @@ App::post('/v1/graphql')
     ->label('abuse-limit', 60)
     ->label('abuse-time', 60)
     ->param('query', '', new Text(1024), 'The query to execute. Max 1024 chars.')
-    ->param('operationName', '', new Text(256), 'Name of the operation to execute', true)
+    ->param('operationName', null, new Text(256), 'Name of the operation to execute', true)
     ->param('variables', [], new JSON(), 'Variables to use in the operation', true)
     ->inject('request')
     ->inject('response')