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-rw-r--r--Python/pylifecycle.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 4f05dfc349..94bbbdb560 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1817,7 +1817,7 @@ create_stdio(const PyConfig *config, PyObject* io,
write_through = Py_True;
else
write_through = Py_False;
- if (isatty && buffered_stdio)
+ if (buffered_stdio && (isatty || fd == fileno(stderr)))
line_buffering = Py_True;
else
line_buffering = Py_False;