diff --git a/nixos/modules/services/ttys/kmscon.nix b/nixos/modules/services/ttys/kmscon.nix
index 8bad42927e3f..88e488425bce 100644
--- a/nixos/modules/services/ttys/kmscon.nix
+++ b/nixos/modules/services/ttys/kmscon.nix
@@ -60,6 +60,7 @@ in {
       ConditionPathExists=/dev/tty0
 
       [Service]
+      ExecStart=
       ExecStart=${pkgs.kmscon}/bin/kmscon "--vt=%I" ${cfg.extraOptions} --seats=seat0 --no-switchvt --configdir ${configDir} --login -- ${pkgs.shadow}/bin/login -p
       UtmpIdentifier=%I
       TTYPath=/dev/%I