1 files changed, 2 insertions, 0 deletions

diff --git a/src/process.c b/src/process.c
index c77b537b664..f33339f5e22 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2300,6 +2300,8 @@ send_process (proc, buf, len)
 #if defined (HAVE_FPATHCONF) && defined (_PC_MAX_CANON)
             pty_max_bytes = fpathconf (XFASTINT (XPROCESS (proc)->outfd),
                                        _PC_MAX_CANON);
+            if (pty_max_bytes < 0)
+              pty_max_bytes = 250;
 #else
             pty_max_bytes = 250;
 #endif