diff --git a/libasn1fix/asn1fix_retrieve.h b/libasn1fix/asn1fix_retrieve.h
index 8ab0260..2aeb82b 100644
--- a/libasn1fix/asn1fix_retrieve.h
+++ b/libasn1fix/asn1fix_retrieve.h
@@ -39,6 +39,7 @@
  */
 asn1p_expr_t *asn1f_lookup_symbol(arg_t *arg,
 		asn1p_module_t *mod,
+		asn1p_expr_t *rhs_pspecs,
 		asn1p_ref_t *ref);
 
 /*