diff --git a/Lib/locale.py b/Lib/locale.py
index 8c44625..a1283a3 100644
--- a/Lib/locale.py
+++ b/Lib/locale.py
@@ -640,7 +640,7 @@
     'tactis':                       'TACTIS',
     'euc_jp':                       'eucJP',
     'euc_kr':                       'eucKR',
-    'utf_8':                        'UTF8',
+    'utf_8':                        'UTF-8',
     'koi8_r':                       'KOI8-R',
     'koi8_u':                       'KOI8-U',
     # XXX This list is still incomplete. If you know more