diff --git a/mozilla/intl/uconv/src/charsetData.properties b/mozilla/intl/uconv/src/charsetData.properties
index 4a021cd9423..b2744ccc461 100644
--- a/mozilla/intl/uconv/src/charsetData.properties
+++ b/mozilla/intl/uconv/src/charsetData.properties
@@ -144,8 +144,10 @@ iso-8859-11.LangGroup              = th
 x-thaittf-0.LangGroup              = th
 us-ascii.LangGroup                 = x-western
 utf-8.LangGroup                    = x-unicode
+utf-16.LangGroup                   = x-unicode
 utf-16be.LangGroup                 = x-unicode
 utf-16le.LangGroup                 = x-unicode
+utf-32.LangGroup                   = x-unicode
 utf-32be.LangGroup                 = x-unicode
 utf-32le.LangGroup                 = x-unicode
 utf-7.LangGroup                    = x-unicode