diff --git a/nixos/modules/services/x11/display-managers/account-service-util.nix b/nixos/modules/services/x11/display-managers/account-service-util.nix
index 46dbdbd4d1a4..0f4d1c0729ad 100644
--- a/nixos/modules/services/x11/display-managers/account-service-util.nix
+++ b/nixos/modules/services/x11/display-managers/account-service-util.nix
@@ -10,7 +10,7 @@
 python3.pkgs.buildPythonApplication {
   name = "set-session";
 
-  format = "other";
+  pyproject = false;
 
   src = ./set-session.py;