diff --git a/nixos/modules/hardware/video/nvidia.nix b/nixos/modules/hardware/video/nvidia.nix
index 52f1773e9c45..50c085dd7ee2 100644
--- a/nixos/modules/hardware/video/nvidia.nix
+++ b/nixos/modules/hardware/video/nvidia.nix
@@ -42,7 +42,7 @@ in
   config = mkIf enabled {
     assertions = [
       {
-        assertion = services.xserver.displayManager.gdm.wayland;
+        assertion = config.services.xserver.displayManager.gdm.wayland;
         message = "NVidia drivers don't support wayland";
       }
     ];