diff --git a/process.c b/process.c
index 4e09d2d9288981..309c0cb72ed7bf 100644
--- a/process.c
+++ b/process.c
@@ -4696,6 +4696,7 @@ rb_spawn_process(struct rb_execarg *eargp, char *errmsg, size_t errmsg_buflen)
 #if HAVE_POSIX_SPAWN
     if (//!eargp->use_shell &&
             // !eargp->pgroup_given &&
+            eargp->close_others_maxhint == -1 &&
             !eargp->umask_given &&
             !eargp->unsetenv_others_given &&
             !eargp->close_others_given &&