diff --git a/nettle-meta.h b/nettle-meta.h
index cce1bdb8104f131eb6f2d1b72fd528872dc54b82..ebffd1cb9c83041126f8b908137617b44ff79429 100644
--- a/nettle-meta.h
+++ b/nettle-meta.h
@@ -150,6 +150,8 @@ struct nettle_hash
  (nettle_hash_digest_func) name##_digest	\
 } 
 
+extern const struct nettle_hash nettle_md2;
+extern const struct nettle_hash nettle_md4;
 extern const struct nettle_hash nettle_md5;
 extern const struct nettle_hash nettle_sha1;
 extern const struct nettle_hash nettle_sha256;