diff --git a/lib/dns/win32/libdns.def.in b/lib/dns/win32/libdns.def.in
index d5a64e24c3..f5ddcafe90 100644
--- a/lib/dns/win32/libdns.def.in
+++ b/lib/dns/win32/libdns.def.in
@@ -508,6 +508,7 @@ dns_message_reply
 dns_message_reset
 dns_message_resetsig
 dns_message_sectiontotext
+dns_message_setclass
 dns_message_setopt
 dns_message_setquerytsig
 dns_message_setsig0key