diff --git a/lib/krb5/auth_context.c b/lib/krb5/auth_context.c
index de600641a..ea7715ea4 100644
--- a/lib/krb5/auth_context.c
+++ b/lib/krb5/auth_context.c
@@ -152,6 +152,10 @@ sockaddr2krb5_address (struct sockaddr *sa,
 	if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
 	    ka->addr_type      = AF_INET;
 	    ka->address.length = sizeof(struct in_addr);
+#ifndef IN6_ADDR_V6_TO_V4
+#define IN6_ADDR_V6_TO_V4(x) (&IN6_EXTRACT_V4ADDR(x))
+#endif
+
 	    ka->address.data   = IN6_ADDR_V6_TO_V4(&sin6->sin6_addr);
 	} else {
 	    ka->addr_type = AF_INET6;
diff --git a/lib/krb5/get_addrs.c b/lib/krb5/get_addrs.c
index c18d57740..7aacd1bbb 100644
--- a/lib/krb5/get_addrs.c
+++ b/lib/krb5/get_addrs.c
@@ -197,6 +197,10 @@ find_all_addresses (krb5_addresses *res, int loop,
 
 	     sin6 = &((struct sockaddr_in6 *)(&ifr->ifr_addr))->sin6_addr;
 
+#ifndef IN6_IS_ADDR_LOOPBACK
+#define IN6_IS_ADDR_LOOPBACK(x) IN6_IS_LOOPBACK(*x)
+#endif
+
 	     if (IN6_IS_ADDR_LOOPBACK(sin6)
 		 || IN6_IS_ADDR_LINKLOCAL(sin6)
 		 || IN6_IS_ADDR_V4COMPAT(sin6)) {