diff --git a/libasn1fix/asn1fix_export.c b/libasn1fix/asn1fix_export.c
index 6eb8cda..bb598bf 100644
--- a/libasn1fix/asn1fix_export.c
+++ b/libasn1fix/asn1fix_export.c
@@ -57,6 +57,21 @@
 	return asn1f_find_terminal_type(&arg, expr);
 }
 
+asn1p_expr_t *
+asn1f_find_ancestor_type_with_PER_constraint_ex(asn1p_t *asn, asn1p_expr_t *expr) {
+	arg_t arg;
+
+	memset(&arg, 0, sizeof(arg));
+
+	arg.asn = asn;
+	arg.mod = expr->module;
+	arg.expr = expr;
+	arg.eh = a1f_replace_me_with_proper_interface_arg.eh;
+	arg.debug = a1f_replace_me_with_proper_interface_arg.debug;
+
+	return asn1f_find_ancestor_type_with_PER_constraint(&arg, expr);
+}
+
 int
 asn1f_fix_dereference_values_ex(asn1p_t *asn, asn1p_module_t *mod,
         asn1p_expr_t *expr) {