diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index ba0c8e4141b..80854001d39 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -554,7 +554,7 @@ def _start_port_server(port_server_port):
         ['python', 'tools/run_tests/port_server.py', '-p', '%d' % port_server_port],
         stderr=subprocess.STDOUT,
         stdout=port_log)
-    # ensure port server is 
+    # ensure port server is up
     waits = 0
     while True:
       if waits > 10: