diff --git a/wchat/qq/SecCheck.php b/wchat/qq/SecCheck.php
index b16ce67..e08fca0 100644
--- a/wchat/qq/SecCheck.php
+++ b/wchat/qq/SecCheck.php
@@ -30,6 +30,7 @@ class SecCheck extends SmallProgram
 		$this->request->setHeader('Content-Type', 'multipart/form-data');
 		$this->request->setErrorField('errCode');
 		$this->request->setErrorMsgField('errMsg');
+		$this->request->setAgent('');
 
 		$real_path = new \CURLFile($path);
 		return $this->request->upload($this->_url . $this->config->getAccessToken(), [