diff --git a/contrib/ports/unix/port/netif/sio.c b/contrib/ports/unix/port/netif/sio.c
index d5a38af1..185a4eca 100644
--- a/contrib/ports/unix/port/netif/sio.c
+++ b/contrib/ports/unix/port/netif/sio.c
@@ -131,6 +131,7 @@ static int sio_init( char * device, int devnum, sio_status_t * siostat )
 	}
 
 #if ! (PPP_SUPPORT || LWIP_HAVE_SLIPIF)
+	memset(&saio, 0, sizeof(struct sigaction));
 	/* install the signal handler before making the device asynchronous */
 	switch ( devnum )
 	{
@@ -147,10 +148,6 @@ static int sio_init( char * device, int devnum, sio_status_t * siostat )
 			break;
 	}
 
-	saio.sa_flags = 0;
-#if defined(LWIP_UNIX_LINUX)
-	saio.sa_restorer = NULL;
-#endif /* LWIP_UNIX_LINUX */
 	sigaction( SIGIO,&saio,NULL );
 
 	/* allow the process to receive SIGIO */