diff --git a/tools/run_tests/start_port_server.py b/tools/run_tests/start_port_server.py
index 5b776f3b305..cca9859d1e9 100755
--- a/tools/run_tests/start_port_server.py
+++ b/tools/run_tests/start_port_server.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python
 
 # Copyright 2017 gRPC authors.
 #