diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index dd91a9672792..0f507564ac6e 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -1175,7 +1175,7 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
 	n = i;			/* in case we lost some during malloc */
 
 	error = 0;
-	xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
+	xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
 	for (i = 0; i < n; i++) {
 		unp = unp_list[i];
 		if (unp->unp_gencnt <= gencnt) {
diff --git a/sys/netinet/tcp_subr.c b/sys/netinet/tcp_subr.c
index bde7f095f26c..4e9038fd6a2f 100644
--- a/sys/netinet/tcp_subr.c
+++ b/sys/netinet/tcp_subr.c
@@ -941,6 +941,8 @@ tcp_pcblist(SYSCTL_HANDLER_ARGS)
 		if (inp->inp_gencnt <= gencnt) {
 			struct xtcpcb xt;
 			caddr_t inp_ppcb;
+
+			bzero(&xt, sizeof(xt));
 			xt.xt_len = sizeof xt;
 			/* XXX should avoid extra copy */
 			bcopy(inp, &xt.xt_inp, sizeof *inp);
diff --git a/sys/netinet/tcp_timewait.c b/sys/netinet/tcp_timewait.c
index bde7f095f26c..4e9038fd6a2f 100644
--- a/sys/netinet/tcp_timewait.c
+++ b/sys/netinet/tcp_timewait.c
@@ -941,6 +941,8 @@ tcp_pcblist(SYSCTL_HANDLER_ARGS)
 		if (inp->inp_gencnt <= gencnt) {
 			struct xtcpcb xt;
 			caddr_t inp_ppcb;
+
+			bzero(&xt, sizeof(xt));
 			xt.xt_len = sizeof xt;
 			/* XXX should avoid extra copy */
 			bcopy(inp, &xt.xt_inp, sizeof *inp);