diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index fbdce93ec7..f821a76099 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -578,6 +578,7 @@ dns_ttl_totext
 dns_validator_cancel
 dns_validator_create
 dns_validator_destroy
+dns_validator_send
 dns_view_adddelegationonly
 dns_view_addzone
 dns_view_attach