diff --git a/src/gb/gprs_ns_sns.c b/src/gb/gprs_ns_sns.c
index cbaa468..dd8d3a2 100644
--- a/src/gb/gprs_ns_sns.c
+++ b/src/gb/gprs_ns_sns.c
@@ -88,6 +88,8 @@
 	struct gprs_nsvc *nsvc;
 	struct sockaddr_in sin;
 	/* copy over. Both data structures use network byte order */
+	memset(&sin, 0, sizeof(sin));
+	sin.sin_family = AF_INET;
 	sin.sin_addr.s_addr = ip4->ip_addr;
 	sin.sin_port = ip4->udp_port;