diff --git a/code/default/lib/noarch/simple_http_server.py b/code/default/lib/noarch/simple_http_server.py
index fbd2769849..dc76a28a95 100644
--- a/code/default/lib/noarch/simple_http_server.py
+++ b/code/default/lib/noarch/simple_http_server.py
@@ -625,7 +625,7 @@ def process_connect(self, sock, address):
             return
 
         client_obj = self.handler(sock, address, self.args)
-        client_thread = threading.Thread(target=client_obj.handle, name="handle_%s:%d" % address)
+        client_thread = threading.Thread(target=client_obj.handle, name="handle:{}".format(address))
         client_thread.start()
 
     def check_listen_port(self, ip, port):