diff --git a/nixos/modules/services/display-managers/sddm.nix b/nixos/modules/services/display-managers/sddm.nix
index a356c550f5d8..711d5c439fc6 100644
--- a/nixos/modules/services/display-managers/sddm.nix
+++ b/nixos/modules/services/display-managers/sddm.nix
@@ -43,7 +43,7 @@ let
       DefaultSession = optionalString (config.services.displayManager.defaultSession != null) "${config.services.displayManager.defaultSession}.desktop";
 
       DisplayServer = if cfg.wayland.enable then "wayland" else "x11";
-    } // optionalAttrs (cfg.wayland.compositor == "kwin") {
+    } // optionalAttrs (cfg.wayland.enable && cfg.wayland.compositor == "kwin") {
       GreeterEnvironment = "QT_WAYLAND_SHELL_INTEGRATION=layer-shell";
       InputMethod = ""; # needed if we are using --inputmethod with kwin
     };