diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index ae033d4..760b2a9 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -853,7 +853,7 @@
                 startupinfo.dwFlags |= _subprocess.STARTF_USESHOWWINDOW
                 startupinfo.wShowWindow = _subprocess.SW_HIDE
                 comspec = os.environ.get("COMSPEC", "cmd.exe")
-                args = comspec + " /c " + args
+                args = comspec + " /c " + '"%s"' % args
                 if (_subprocess.GetVersion() >= 0x80000000 or
                         os.path.basename(comspec).lower() == "command.com"):
                     # Win9x, or using command.com on NT. We need to