diff --git a/src/xpdev/sockwrap.c b/src/xpdev/sockwrap.c
index eb91b239c4798bb609b465aa7de357ec57e95cd6..c386fb0e9143349c8a22d30603ffbf7a89c4e8c2 100644
--- a/src/xpdev/sockwrap.c
+++ b/src/xpdev/sockwrap.c
@@ -395,6 +395,7 @@ const char *inet_addrtop(SOCKADDR *in, char *dest, size_t size)
 		case AF_INET6:
 			return inet_ntop(in->sa_family, &((struct sockaddr_in6 *)in)->sin6_addr, dest, size);
 		default:
+			safe_snprintf(dest, size, "<unknown address>");
 			return NULL;
 	}
 }