diff --git a/src/socket_util.c b/src/socket_util.c
index 0fea281f0..0b38a1468 100644
--- a/src/socket_util.c
+++ b/src/socket_util.c
@@ -33,14 +33,14 @@
 char *
 sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error)
 {
-#ifdef HAVE_IPV6
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
 	const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)sa;
 	struct sockaddr_in a4;
 #endif
 	int ret;
 	char host[NI_MAXHOST], serv[NI_MAXSERV];
 
-#ifdef HAVE_IPV6
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
 	if (sa->sa_family == AF_INET6 &&
 	    IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) {
 		/* convert "::ffff:127.0.0.1" to "127.0.0.1" */