diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index a8406544a72f..2247bf7ce4ab 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -329,7 +329,7 @@ in
       };
 
       xkbOptions = mkOption {
-        type = types.str;
+        type = types.commas;
         default = "terminate:ctrl_alt_bksp";
         example = "grp:caps_toggle, grp_led:scroll";
         description = ''