diff --git a/wx/Recharge.php b/wx/Recharge.php
index 3319660..815755a 100644
--- a/wx/Recharge.php
+++ b/wx/Recharge.php
@@ -108,7 +108,7 @@ class Recharge extends Miniprogarampage
 		$key = $this->config->getKey();
 		$sign_type = $this->config->getSignType();
 
-		$data['sign'] = Help::sign($this->data, $key, $sign_type);
+		$this->data['sign'] = Help::sign($this->data, $key, $sign_type);
 		return Help::toXml($this->data);
 	}