diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index a3054c17de..1397362b96 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -208,6 +208,7 @@ dns_dnssec_keyfromrdata
 dns_dnssec_keylistfromrdataset
 dns_dnssec_selfsigns
 dns_dnssec_sign
+dns_dnssec_signs
 dns_dnssec_signmessage
 dns_dnssec_updatekeys
 dns_dnssec_verify