1 files changed, 2 insertions, 0 deletions

diff --git a/src/emacs.c b/src/emacs.c
index 3757d5ae6b2..cbdc2a2f748 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -379,8 +379,10 @@ main (argc, argv, envp)
       signal (22, fatal_error_signal);
       signal (23, fatal_error_signal);
       signal (24, fatal_error_signal);
+#ifdef SIGIO
       signal (SIGAIO, fatal_error_signal);
       signal (SIGPTY, fatal_error_signal);
+#endif
       signal (SIGIOINT, fatal_error_signal);
       signal (SIGGRANT, fatal_error_signal);
       signal (SIGRETRACT, fatal_error_signal);