diff --git a/lib/hx509/version-script.map b/lib/hx509/version-script.map
index d89ffd27c..e767b47d2 100644
--- a/lib/hx509/version-script.map
+++ b/lib/hx509/version-script.map
@@ -84,6 +84,7 @@ HEIMDAL_X509_1.2 {
 		hx509_certs_add;
 		hx509_certs_append;
 		hx509_certs_end_seq;
+		hx509_certs_ref;
 		hx509_certs_filter;
 		hx509_certs_find;
 		hx509_certs_free;