diff --git a/contrib/ports/unix/port/netif/sio.c b/contrib/ports/unix/port/netif/sio.c
index 8d8be9be..a6560ba4 100644
--- a/contrib/ports/unix/port/netif/sio.c
+++ b/contrib/ports/unix/port/netif/sio.c
@@ -35,7 +35,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
-#if defined(LWIP_UNIX_OPENBSD)
+#if defined(LWIP_UNIX_OPENBSD) || defined(LWIP_UNIX_MACH)
 #include <util.h>
 #endif
 #include <termios.h>