diff --git a/nixos/modules/config/i18n.nix b/nixos/modules/config/i18n.nix
index fa2dc691d793..aa8f06d1c7f2 100644
--- a/nixos/modules/config/i18n.nix
+++ b/nixos/modules/config/i18n.nix
@@ -7,21 +7,22 @@
 let
   sanitizeUTF8Capitalization =
     lang: (lib.replaceStrings [ "utf8" "utf-8" "UTF8" ] [ "UTF-8" "UTF-8" "UTF-8" ] lang);
-  aggregatedLocales = lib.optionals (config.i18n.defaultLocale != "C") [
-    "${config.i18n.defaultLocale}/${config.i18n.defaultCharset}"
-  ]
-  ++ lib.pipe config.i18n.extraLocaleSettings [
-    # See description of extraLocaleSettings for why is this ignored here.
-    (x: lib.removeAttrs x [ "LANGUAGE" ])
-    (lib.mapAttrs (n: v: (sanitizeUTF8Capitalization v)))
-    # C locales are always installed
-    (lib.filterAttrs (n: v: v != "C"))
-    (lib.mapAttrsToList (LCRole: lang: lang + "/" + (config.i18n.localeCharsets.${LCRole} or "UTF-8")))
-  ]
-  ++ (map sanitizeUTF8Capitalization (
-    lib.optionals (builtins.isList config.i18n.extraLocales) config.i18n.extraLocales
-  ))
-  ++ (lib.optional (builtins.isString config.i18n.extraLocales) config.i18n.extraLocales);
+  aggregatedLocales =
+    lib.optionals (config.i18n.defaultLocale != "C") [
+      "${config.i18n.defaultLocale}/${config.i18n.defaultCharset}"
+    ]
+    ++ lib.pipe config.i18n.extraLocaleSettings [
+      # See description of extraLocaleSettings for why is this ignored here.
+      (x: lib.removeAttrs x [ "LANGUAGE" ])
+      (lib.mapAttrs (n: v: (sanitizeUTF8Capitalization v)))
+      # C locales are always installed
+      (lib.filterAttrs (n: v: v != "C"))
+      (lib.mapAttrsToList (LCRole: lang: lang + "/" + (config.i18n.localeCharsets.${LCRole} or "UTF-8")))
+    ]
+    ++ (map sanitizeUTF8Capitalization (
+      lib.optionals (builtins.isList config.i18n.extraLocales) config.i18n.extraLocales
+    ))
+    ++ (lib.optional (builtins.isString config.i18n.extraLocales) config.i18n.extraLocales);
 in
 {
   ###### interface