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-rw-r--r--Lib/subprocess.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index adbee0b..ad6fd1f 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -843,7 +843,7 @@ class Popen(object):
# Process startup details
if startupinfo is None:
startupinfo = STARTUPINFO()
- if None not in (p2cread, c2pwrite, errwrite):
+ if -1 not in (p2cread, c2pwrite, errwrite):
startupinfo.dwFlags |= _subprocess.STARTF_USESTDHANDLES
startupinfo.hStdInput = p2cread
startupinfo.hStdOutput = c2pwrite