diff --git a/modules/services/x11/window-managers/i3.nix b/modules/services/x11/window-managers/i3.nix
index 705a2762ea6..d688c064c5a 100644
--- a/modules/services/x11/window-managers/i3.nix
+++ b/modules/services/x11/window-managers/i3.nix
@@ -16,9 +16,9 @@ in
     };
   };
 
-  config = {
+  config = mkIf cfg.enable {
     services.xserver.windowManager = {
-      session = mkIf cfg.enable [{
+      session = [{
         name = "i3";
         start = "
           ${pkgs.i3}/bin/i3 &