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-rw-r--r--src/callproc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/callproc.c b/src/callproc.c
index e8e4c48b5be..2d457b3c84c 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -1574,7 +1574,7 @@ emacs_spawn (pid_t *newpid, int std_in, int std_out, int std_err,
#endif /* not DONT_REOPEN_PTY */
#ifdef SETUP_SLAVE_PTY
- if (pty_flag)
+ if (pty_in && std_in >= 0)
{
SETUP_SLAVE_PTY;
}