diff --git a/conf/locale.conf b/conf/locale.conf
index b0b88ba9..3e477197 100644
--- a/conf/locale.conf
+++ b/conf/locale.conf
@@ -3,15 +3,15 @@
 # See also https://mikaela.info/locale
 
 # Default language & everything: en_GB.UTF-8
-LANG=en_GB.UTF-8
+LANG=en_GB.utf8
 # The primary language & fallbacks (pam_environment was unhappy with only
 # $LANG in my test).
 LANGUAGE=en_GB.UTF-8:en_US.UTF-8:en
 # ISO 8601
-LC_TIME=en_DK.UTF-8
+LC_TIME=en_DK.utf8
 # € not £
-LC_MONETARY=fi_FI.UTF-8
+LC_MONETARY=fi_FI.utf8
 # no Mx, just the name
-LC_NAME=fi_FI.UTF-8
+LC_NAME=fi_FI.utf8
 # +358...
-LC_TELEPHONE=fi_FI.UTF-8
+LC_TELEPHONE=fi_FI.utf8