diff --git a/src/Providers/WeChatProvider.php b/src/Providers/WeChatProvider.php
index 7041427..846a01f 100644
--- a/src/Providers/WeChatProvider.php
+++ b/src/Providers/WeChatProvider.php
@@ -78,13 +78,13 @@ protected function buildAuthUrlFromBase($url, $state)
      */
     protected function getCodeFields($state = null)
     {
-        return [
+        return array_merge([
             'appid'         => $this->clientId,
             'redirect_uri'  => $this->redirectUrl,
             'response_type' => 'code',
             'scope'         => $this->formatScopes($this->scopes, $this->scopeSeparator),
             'state'         => $state ?: md5(time()),
-        ];
+        ], $this->parameters);
     }
 
     /**