diff --git a/skeletons/BIT_STRING.c b/skeletons/BIT_STRING.c
index 900f41d..7434a2e 100644
--- a/skeletons/BIT_STRING.c
+++ b/skeletons/BIT_STRING.c
@@ -45,18 +45,18 @@
  */
 int
 BIT_STRING_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
-		asn_app_consume_bytes_f *app_errlog, void *app_key) {
+		asn_app_constraint_failed_f *ctfailcb, void *app_key) {
 	const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
 
 	if(st && st->buf) {
 		if(st->size == 1 && st->bits_unused) {
-			_ASN_ERRLOG(app_errlog, app_key,
+			_ASN_CTFAIL(app_key, td,
 				"%s: invalid padding byte (%s:%d)",
 				td->name, __FILE__, __LINE__);
 			return -1;
 		}
 	} else {
-		_ASN_ERRLOG(app_errlog, app_key,
+		_ASN_CTFAIL(app_key, td,
 			"%s: value not given (%s:%d)",
 			td->name, __FILE__, __LINE__);
 		return -1;