diff --git a/src/BaseFunc.php b/src/BaseFunc.php
index 2aa8b04..8996f9a 100644
--- a/src/BaseFunc.php
+++ b/src/BaseFunc.php
@@ -235,5 +235,6 @@ private function toRequestJson(BaseCommand $request): ?string
     public function setOnceHeaders(array $onceHeaders)
     {
         $this->onceHeaders = $onceHeaders;
+        return $this;
     }
 }