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-rw-r--r--ext/pty/pty.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/pty/pty.c b/ext/pty/pty.c
index def44b6f41..b7c69fe400 100644
--- a/ext/pty/pty.c
+++ b/ext/pty/pty.c
@@ -433,7 +433,7 @@ pty_getpty(argc, argv, self)
rfptr->f = fdopen(info.fd, "r");
rfptr->path = strdup(SlaveName);
- wfptr->mode = rb_io_mode_flags("w");
+ wfptr->mode = rb_io_mode_flags("w") | FMODE_SYNC;
wfptr->f = fdopen(dup(info.fd), "w");
wfptr->path = strdup(SlaveName);