diff --git a/src/midea_helper.rs b/src/midea_helper.rs
index f8bab63..6f0f6f2 100644
--- a/src/midea_helper.rs
+++ b/src/midea_helper.rs
@@ -11,10 +11,10 @@ enum LoginInfo {
 }
 
 impl LoginInfo {
-    const MIDEA_KEY_EMAIL: &str = "midea_cloud_mail";
-    const MIDEA_KEY_PW: &str = "midea_cloud_pw";
-    const MIDEA_KEY_TOKEN: &str = "midea_token";
-    const MIDEA_KEY_KEY: &str = "midea_key";
+    const MIDEA_KEY_EMAIL: &'static str = "midea_cloud_mail";
+    const MIDEA_KEY_PW: &'static str = "midea_cloud_pw";
+    const MIDEA_KEY_TOKEN: &'static str = "midea_token";
+    const MIDEA_KEY_KEY: &'static str = "midea_key";
 
     fn new(db: &Arc<Mutex<DataBase>>, device_id: u64) -> Result<LoginInfo> {
         let db_lock = db.lock().unwrap();