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
diff --git a/Misc/NEWS b/Misc/NEWS
index f6eb63e..8f994b9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -72,6 +72,9 @@
 Library
 -------
 
+- Issue #10154, #10090: change the normalization of UTF-8 to "UTF-8" instead
+  of "UTF8" in the locale module as the latter is not supported MacOSX and OpenBSD.
+
 - Issue #10756: atexit normalizes the exception before displaying it. Patch by
   Andreas Stührk.