diff --git a/component/common/api/at_cmd/atcmd_wifi.c b/component/common/api/at_cmd/atcmd_wifi.c
index 0688750e..e92e35c5 100644
--- a/component/common/api/at_cmd/atcmd_wifi.c
+++ b/component/common/api/at_cmd/atcmd_wifi.c
@@ -810,7 +810,7 @@ void fATW4(void *arg){
         ret = RTW_BADARG;
         goto exit;
     }
-    memset((char *)ap.ssid.val, '\0', sizeof(ap.ssid.val));
+    memset((char *)password, '\0', sizeof(password));
     strncpy((char *)password, (char*)arg, sizeof(password) - 1);
     ap.password = password;
     ap.password_len = strlen((char*)arg);