diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index f590d359f5..7661f807ec 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -677,6 +677,7 @@ dns_secalg_fromtext
 dns_secalg_totext
 dns_secproto_fromtext
 dns_secproto_totext
+dns_soa_buildrdata
 dns_soa_getminimum
 dns_soa_getserial
 dns_soa_setserial