1 files changed, 1 insertions, 1 deletions

diff --git a/src/process.c b/src/process.c
index d1b14533c99..4449493a2b6 100644
--- a/src/process.c
+++ b/src/process.c
@@ -5134,7 +5134,7 @@ read_and_dispose_of_process_output (struct Lisp_Process *p, char *chars,
          proc_encode_coding_system[p->outfd] surely points to a
          valid memory because p->outfd will be changed once EOF is
          sent to the process.  */
-      if (NILP (p->encode_coding_system) && p->outfd
+      if (NILP (p->encode_coding_system) && p->outfd >= 0
           && proc_encode_coding_system[p->outfd])
         {
           pset_encode_coding_system