diff --git a/lib/iso9660/libiso9660.sym b/lib/iso9660/libiso9660.sym
index f12fee32..45e13d96 100644
--- a/lib/iso9660/libiso9660.sym
+++ b/lib/iso9660/libiso9660.sym
@@ -71,3 +71,4 @@ iso9660_set_ltime
 iso9660_set_pvd
 iso9660_strncpy_pad
 iso9660_xa_init
+ISO_STANDARD_ID