diff --git a/hosts/phantom/default.nix b/hosts/phantom/default.nix
index 9111434..1b0d3cb 100644
--- a/hosts/phantom/default.nix
+++ b/hosts/phantom/default.nix
@@ -53,7 +53,7 @@
   # Set your time zone.
   time.timeZone = "America/Sao_Paulo";
   # Select internationalisation properties.
-  i18n.defaultLocale = "pt_BR.utf8";
+  i18n.defaultLocale = "pt_BR.UTF-8";
 
   boot.kernel.sysctl."fs.inotify.max_user_watches" = 1048576;
 
diff --git a/system/locale.nix b/system/locale.nix
index 07e7175..e2c7e81 100644
--- a/system/locale.nix
+++ b/system/locale.nix
@@ -2,7 +2,7 @@
 {
   time.timeZone = "America/Sao_Paulo";
   environment.variables.TZ = config.time.timeZone;
-  i18n.defaultLocale = "pt_BR.utf8";
+  i18n.defaultLocale = "pt_BR.UTF-8";
 
   # Configure keymap in X11
   services.xserver.xkb = {