diff --git a/libasn1fix/asn1fix_constr.h b/libasn1fix/asn1fix_constr.h
index 59970ad..ffed143 100644
--- a/libasn1fix/asn1fix_constr.h
+++ b/libasn1fix/asn1fix_constr.h
@@ -14,7 +14,7 @@
 /*
  * Fix tagging in constructed types.
  */
-int asn1f_fix_constr_tag(arg_t *);
+int asn1f_fix_constr_tag(arg_t *, int fix_top_level);
 
 /*
  * Check distinctive tagging in constructed types.