diff --git a/lib/hx509/ks_null.c b/lib/hx509/ks_null.c
index 934eef5a0..0b571c840 100644
--- a/lib/hx509/ks_null.c
+++ b/lib/hx509/ks_null.c
@@ -90,3 +90,9 @@ struct hx509_keyset_ops keyset_null = {
     null_iter,
     null_iter_end
 };
+
+void
+_hx509_ks_null_register(hx509_context context)
+{
+    _hx509_ks_register(context, &keyset_null);
+}