diff --git a/access_token.go b/access_token.go
index 60a6ebc..bfe3518 100644
--- a/access_token.go
+++ b/access_token.go
@@ -51,7 +51,7 @@ func GetStableAccessToken(appid, secret string) (wx_access_token_res, error) {
 	p_data["secret"] = secret
 	p_data["force_refresh"] = false
 
-	requestDataJson, err := json.Marshal(data)
+	requestDataJson, err := json.Marshal(p_data)
 
 	if err != nil {
 		log.Println("getStableAccessToken Marshal err", err)