diff --git a/mozilla/intl/uconv/src/charsetData.properties b/mozilla/intl/uconv/src/charsetData.properties
index 01e3ed0ca53..3eff697bd62 100644
--- a/mozilla/intl/uconv/src/charsetData.properties
+++ b/mozilla/intl/uconv/src/charsetData.properties
@@ -113,6 +113,7 @@ x-mac-turkish.LangGroup            = tr
 x-mac-ukrainian.LangGroup          = x-cyrillic
 x-user-defined.LangGroup           = x-user-def
 x-x11johab.LangGroup               = ko
+x-johab.LangGroup                  = ko
 
 utf-8.MIMEHeaderEncodingMethod  = B
 utf-8.MIMEMailCharset           = utf-8