diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index da6b5cfea9..65be5c440e 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -5932,7 +5932,7 @@ _socktype(isc_sockettype_t type)
 ISC_SOCKETFUNC_SCOPE int
 isc_socketmgr_renderxml(isc_socketmgr_t *mgr0, xmlTextWriterPtr writer) {
 	isc__socketmgr_t *mgr = (isc__socketmgr_t *)mgr0;
-	isc__socket_t *sock;
+	isc__socket_t *sock = NULL;
 	char peerbuf[ISC_SOCKADDR_FORMATSIZE];
 	isc_sockaddr_t addr;
 	ISC_SOCKADDR_LEN_T len;