diff --git a/nettle-internal.h b/nettle-internal.h
index 9b0f9e8d86cd76acda671f5af2a361552ea881e9..97b15e07c3e40798dc009ddab6f10bb6ce134c9e 100644
--- a/nettle-internal.h
+++ b/nettle-internal.h
@@ -63,6 +63,10 @@ extern const struct nettle_cipher nettle_blowfish128;
  * code is not included in the nettle library, as that would make the
  * shared library depend on openssl. Instead, look at
  * examples/nettle-openssl.c. */
+extern const struct nettle_cipher nettle_openssl_aes128;
+extern const struct nettle_cipher nettle_openssl_aes192;
+extern const struct nettle_cipher nettle_openssl_aes256;
+extern const struct nettle_cipher nettle_openssl_arcfour128;
 extern const struct nettle_cipher nettle_openssl_blowfish128;
 extern const struct nettle_cipher nettle_openssl_des;
 extern const struct nettle_cipher nettle_openssl_cast128;