diff --git a/lib/isc/win32/libisc.def.in b/lib/isc/win32/libisc.def.in
index 3d979614e6..49a8e6aca5 100644
--- a/lib/isc/win32/libisc.def.in
+++ b/lib/isc/win32/libisc.def.in
@@ -578,6 +578,7 @@ isc_sockaddr_setport
 isc_sockaddr_totext
 isc_sockaddr_v6fromin
 @IF UNIXONLY
+isc_socket_accept
 isc_socket_attach
 isc_socket_bind
 isc_socket_cancel