diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index 21f5d2c238..43ef4b3aed 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -650,6 +650,7 @@ dns_secalg_fromtext
 dns_secalg_totext
 dns_secproto_fromtext
 dns_secproto_totext
+dns_soa_buildrdata
 dns_soa_getminimum
 dns_soa_getserial
 dns_soa_setserial