diff --git a/lib/isc/win32/libisc.def.in b/lib/isc/win32/libisc.def.in
index cf27a6f899..074283a30c 100644
--- a/lib/isc/win32/libisc.def.in
+++ b/lib/isc/win32/libisc.def.in
@@ -462,7 +462,6 @@ isc_msgcat_get
 isc_msgcat_open
 isc_mutexblock_destroy
 isc_mutexblock_init
-isc_net_aton
 isc_net_disableipv4
 isc_net_disableipv6
 isc_net_enableipv4