diff --git a/Lib/telnetlib.py b/Lib/telnetlib.py
index c60578d..82b5e8f 100644
--- a/Lib/telnetlib.py
+++ b/Lib/telnetlib.py
@@ -236,7 +236,7 @@
 
         """
         if self.debuglevel > 0:
-            print('Telnet(%s,%d):' % (self.host, self.port), end=' ')
+            print('Telnet(%s,%s):' % (self.host, self.port), end=' ')
             if args:
                 print(msg % args)
             else: