diff --git a/drivers/netjack/net_driver.c b/drivers/netjack/net_driver.c
index c60b199..6f0665c 100644
--- a/drivers/netjack/net_driver.c
+++ b/drivers/netjack/net_driver.c
@@ -469,12 +469,19 @@ net_driver_write (net_driver_t* driver, jack_nframes_t nframes)
     if (driver->srcaddress_valid)
     {
 	int r;
+
+#ifdef __APPLE__
+	static const int flag = 0;
+#else
+	static const int flag = MSG_CONFIRM;
+#endif
+
         if (driver->reply_port)
             driver->syncsource_address.sin_port = htons(driver->reply_port);
 
 	for( r=0; r<driver->redundancy; r++ )
 	    netjack_sendto(driver->outsockfd, (char *)packet_buf, packet_size,
-		    MSG_CONFIRM, (struct sockaddr*)&(driver->syncsource_address), sizeof(struct sockaddr_in), driver->mtu);
+			   flag, (struct sockaddr*)&(driver->syncsource_address), sizeof(struct sockaddr_in), driver->mtu);
     }
 
     return 0;
diff --git a/drivers/netjack/netjack_packet.c b/drivers/netjack/netjack_packet.c
index 08c6697..d602fed 100644
--- a/drivers/netjack/netjack_packet.c
+++ b/drivers/netjack/netjack_packet.c
@@ -476,7 +476,7 @@ packet_cache_drain_socket( packet_cache *pcache, int sockfd )
     while (1)
     {
         rcv_len = recvfrom (sockfd, rx_packet, pcache->mtu, MSG_DONTWAIT,
-			    &sender_address, &senderlen);
+			    (struct sockaddr*) &sender_address, &senderlen);
         if (rcv_len < 0)
             return;
 
@@ -763,7 +763,7 @@ netjack_sendto (int sockfd, char *packet_buf, int pkt_size, int flags, struct so
         //jack_error("last fragment_count = %d, payload_size = %d\n", fragment_count, last_payload_size);
 
         // sendto(last_pack_size);
-        sendto(sockfd, tx_packet, last_payload_size + sizeof(jacknet_packet_header), flags, addr, addr_size);
+        err = sendto(sockfd, tx_packet, last_payload_size + sizeof(jacknet_packet_header), flags, addr, addr_size);
 	if( err<0 ) {
 	    printf( "error in send\n" );
 	    perror( "send" );