diff --git a/lib/dns/win32/libdns.def b/lib/dns/win32/libdns.def
index 97ba42e214..59991df744 100644
--- a/lib/dns/win32/libdns.def
+++ b/lib/dns/win32/libdns.def
@@ -364,6 +364,7 @@ dns_peer_getsupportedns
 dns_peer_gettransferformat
 dns_peer_gettransfers
 dns_peer_new
+dns_peer_newprefix
 dns_peer_setbogus
 dns_peer_setkey
 dns_peer_setkeybycharp