diff --git a/contrib/ldns/ldns/dnssec_verify.h b/contrib/ldns/ldns/dnssec_verify.h
index 0c41e8c11b62..e8b1a9102670 100644
--- a/contrib/ldns/ldns/dnssec_verify.h
+++ b/contrib/ldns/ldns/dnssec_verify.h
@@ -294,23 +294,6 @@ void ldns_dnssec_derive_trust_tree_dnskey_rrset_time(
 	    ldns_rr *cur_rr, ldns_rr *cur_sig_rr,
 	    time_t check_time);
 
-
-/**
- * Sub function for derive_trust_tree that is used for DNSKEY rrsets
- *
- * \param[in] new_tree The trust tree that we are building
- * \param[in] data_chain The data chain containing the data for the trust tree
- * \param[in] cur_rr The currently relevant DNSKEY RR
- * \param[in] cur_sig_rr The currently relevant signature
- * \param[in] check_time the time for which the validation is performed
- */
-void ldns_dnssec_derive_trust_tree_dnskey_rrset_time(
-         ldns_dnssec_trust_tree *new_tree,
-	    ldns_dnssec_data_chain *data_chain,
-	    ldns_rr *cur_rr, ldns_rr *cur_sig_rr,
-	    time_t check_time);
-
-
 /**
  * Sub function for derive_trust_tree that is used for DS rrsets
  *