diff --git a/lib/krb5/addr_families.c b/lib/krb5/addr_families.c
index 383b98fec..7cdc74b94 100644
--- a/lib/krb5/addr_families.c
+++ b/lib/krb5/addr_families.c
@@ -128,7 +128,11 @@ ipv6_sockaddr2addr (const struct sockaddr *sa, krb5_address *a)
 
 	a->addr_type      = KRB5_ADDRESS_INET;
 #ifndef IN6_ADDR_V6_TO_V4
+#ifdef IN6_EXTRACT_V4ADDR
 #define IN6_ADDR_V6_TO_V4(x) (&IN6_EXTRACT_V4ADDR(x))
+#else
+#define IN6_ADDR_V6_TO_V4(x) ((struct in_addr *)&(x)->s6_addr32[3])
+#endif
 #endif
 	memcpy (buf, IN6_ADDR_V6_TO_V4(&sin6->sin6_addr), 4);
 	return krb5_data_copy(&a->address, buf, 4);