diff --git a/mozilla/intl/uconv/src/charsetalias.properties b/mozilla/intl/uconv/src/charsetalias.properties
index 8ae0e435852..d663d7e5868 100644
--- a/mozilla/intl/uconv/src/charsetalias.properties
+++ b/mozilla/intl/uconv/src/charsetalias.properties
@@ -86,6 +86,8 @@ x-viet-vps=x-viet-vps
 x-viet-vni=x-viet-vni
 x-iso-10646-ucs-2-le=X-ISO-10646-UCS-2-LE
 x-iso-10646-ucs-4-le=X-ISO-10646-UCS-4-LE
+x-iso-10646-ucs-2-be=X-ISO-10646-UCS-2-BE
+x-iso-10646-ucs-4-be=X-ISO-10646-UCS-4-BE
 x-user-defined=x-user-defined
 x-u-escaped=x-u-escaped
 ##