diff --git a/tools/test.py b/tools/test.py
index 6e1262931ff93d..671d028cae4e59 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -617,7 +617,6 @@ def RunProcess(context, timeout, args, **rest):
   pty_out = rest.pop('pty_out')
 
   process = subprocess.Popen(
-    shell = utils.IsWindows(),
     args = popen_args,
     **rest
   )