diff --git a/nixos/modules/virtualisation/xen-dom0.nix b/nixos/modules/virtualisation/xen-dom0.nix
index 5ad647769bb..5b57ca860da 100644
--- a/nixos/modules/virtualisation/xen-dom0.nix
+++ b/nixos/modules/virtualisation/xen-dom0.nix
@@ -57,7 +57,8 @@ in
 
     virtualisation.xen.bootParams =
       mkOption {
-        default = "";
+        default = [];
+        type = types.listOf types.str;
         description =
           ''
             Parameters passed to the Xen hypervisor at boot time.
@@ -68,6 +69,7 @@ in
       mkOption {
         default = 0;
         example = 512;
+        type = types.addCheck types.int (n: n >= 0);
         description =
           ''
             Amount of memory (in MiB) allocated to Domain 0 on boot.
@@ -78,6 +80,7 @@ in
     virtualisation.xen.bridge = {
         name = mkOption {
           default = "xenbr0";
+          type = types.str;
           description = ''
               Name of bridge the Xen domUs connect to.
             '';