diff --git a/config/i18n.nix b/config/i18n.nix
index d42f4311..b59c4252 100644
--- a/config/i18n.nix
+++ b/config/i18n.nix
@@ -10,8 +10,8 @@
     LC_TIME = "de_DE.UTF-8";
   };
   i18n.supportedLocales = [
-    "C/UTF-8"
-    "en_US/UTF-8"
-    "de_DE/UTF-8"
+    "C.UTF-8/UTF-8"
+    "en_US.UTF-8/UTF-8"
+    "de_DE.UTF-8/UTF-8"
   ];
 }