diff --git a/9xiu.py b/9xiu.py
index 49b5c0c..dc204f2 100644
--- a/9xiu.py
+++ b/9xiu.py
@@ -10,7 +10,7 @@ class JXiu:
 
     def get_real_url(self):
         with requests.Session() as s:
-            url = 'https://h5.9xiu.com/room/live/enterRoom?rid=' + str( self.rid)
+            url = f'https://h5.9xiu.com/room/live/enterRoom?rid={self.rid}'
             headers = {
                 'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) '
                               'AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1'