diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index bf16469f4e..e91ce4d4b8 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -925,6 +925,7 @@ dns_zone_setxfrsource4
 dns_zone_setxfrsource6
 dns_zone_setzeronosoattl
 dns_zone_signwithkey
+dns_zone_synckeyzone
 dns_zone_unload
 dns_zonekey_iszonekey
 dns_zonemgr_attach