diff --git a/shadowsocks/shell.py b/shadowsocks/shell.py
index babac98..ed0cc42 100644
--- a/shadowsocks/shell.py
+++ b/shadowsocks/shell.py
@@ -283,7 +283,7 @@ def get_config(is_local):
         level = logging.INFO
     verbose = config['verbose']
     logging.basicConfig(level=level,
-                        format='%(asctime)s %(levelname)-8s %(message)s',
+                        format='%(asctime)s %(levelname)-8s %(filename)s:%(lineno)s %(message)s',
                         datefmt='%Y-%m-%d %H:%M:%S')
 
     check_config(config, is_local)