diff --git a/src/Wechat/QRCode.php b/src/Wechat/QRCode.php
index d843628a9..b73a3b44e 100644
--- a/src/Wechat/QRCode.php
+++ b/src/Wechat/QRCode.php
@@ -141,7 +141,7 @@ public function card($card, $temporary = true, $expireSeconds = null)
      */
     public function show($ticket)
     {
-        return self::API_SHOW."?ticket={$ticket}";
+        return sprintf('%s?ticket=%s', self::API_SHOW, urlencode($ticket));
     }
 
     /**