diff --git a/lib/dns/win32/libdns.def.in b/lib/dns/win32/libdns.def.in
index 605e56daef..6704d0a01a 100644
--- a/lib/dns/win32/libdns.def.in
+++ b/lib/dns/win32/libdns.def.in
@@ -437,6 +437,7 @@ dns_master_rdatasettotext
 dns_master_stylecreate
 dns_master_stylecreate2
 dns_master_styledestroy
+dns_master_styleflags
 dns_message_addname
 dns_message_buildopt
 dns_message_checksig