diff --git a/lib/isc/win32/libisc.def.in b/lib/isc/win32/libisc.def.in
index 9436325016..624ed432df 100644
--- a/lib/isc/win32/libisc.def.in
+++ b/lib/isc/win32/libisc.def.in
@@ -167,6 +167,10 @@ isc_base32hex_decoderegion
 isc_base32hex_decodestring
 isc_base32hex_tobuffer
 isc_base32hex_totext
+isc_base32hexnp_decoderegion
+isc_base32hexnp_decodestring
+isc_base32hexnp_tobuffer
+isc_base32hexnp_totext
 isc_base64_decodestring
 isc_base64_tobuffer
 isc_base64_totext