diff --git a/modules/config/i18n.nix b/modules/config/i18n.nix
index e964b9bfb1d..0fb91771934 100644
--- a/modules/config/i18n.nix
+++ b/modules/config/i18n.nix
@@ -46,6 +46,7 @@ let
         description = "
           The keyboard mapping table for the virtual consoles.
         ";
+        type = types.uniq types.string;
       };
 
     };