diff --git a/src/add-ons/kernel/network/protocols/udp/udp.c b/src/add-ons/kernel/network/protocols/udp/udp.c
index 6f9f620799..436e0efc4f 100644
--- a/src/add-ons/kernel/network/protocols/udp/udp.c
+++ b/src/add-ons/kernel/network/protocols/udp/udp.c
@@ -338,6 +338,7 @@ static void udp_init(void)
 	udb.inp_prev = udb.inp_next = &udb;
 	udp_sendspace = 9216; /* default size */
 	udp_recvspace = 41600; /* default size */
+	udp_in.sin_family = AF_INET;
 	udp_in.sin_len = sizeof(udp_in);
 	memset(&udpstat, 0, sizeof(udpstat));