diff --git a/third_party/nixpkgs/nixos/modules/virtualisation/hyperv-guest.nix b/third_party/nixpkgs/nixos/modules/virtualisation/hyperv-guest.nix
index b3bcfff198..fb6502644b 100644
--- a/third_party/nixpkgs/nixos/modules/virtualisation/hyperv-guest.nix
+++ b/third_party/nixpkgs/nixos/modules/virtualisation/hyperv-guest.nix
@@ -34,7 +34,7 @@ in {
       initrd.availableKernelModules = [ "hyperv_keyboard" ];
 
       kernelParams = [
-        "video=hyperv_fb:${cfg.videoMode} elevator=noop"
+        "video=hyperv_fb:${cfg.videoMode}" "elevator=noop"
       ];
     };