diff --git a/deployment/check/data-model-tf-proxmox/default.nix b/deployment/check/data-model-tf-proxmox/default.nix
index 6ba05a6a..c70226f5 100644
--- a/deployment/check/data-model-tf-proxmox/default.nix
+++ b/deployment/check/data-model-tf-proxmox/default.nix
@@ -10,7 +10,9 @@ let
     overlays = [ overlay ];
   };
   overlay = _: prev: {
-    terraform-backend = prev.callPackage ../../modules/terraform-backend/package.nix { };
+    terraform-backend =
+      prev.callPackage "${sources.nixpkgs-unstable}/pkgs/by-name/te/terraform-backend/package.nix"
+        { };
     inherit
       (import "${sources.proxmox-nixos}/pkgs" {
         craneLib = pkgs.callPackage "${sources.crane}/lib" { };