diff --git a/intl/uconv/src/charsetData.properties b/intl/uconv/src/charsetData.properties
index 8a27149c8ff9..044adac29661 100644
--- a/intl/uconv/src/charsetData.properties
+++ b/intl/uconv/src/charsetData.properties
@@ -93,6 +93,7 @@ koi8-r.LangGroup                   = x-cyrillic
 koi8-u.LangGroup                   = x-cyrillic
 shift_jis.LangGroup                = ja
 tis-620.LangGroup                  = th
+tis620-2.LangGroup                 = th
 us-ascii.LangGroup                 = x-western
 utf-16be.LangGroup                 = x-unicode
 utf-16le.LangGroup                 = x-unicode