diff --git a/default.nix b/default.nix
index c3c89a3..7c61704 100644
--- a/default.nix
+++ b/default.nix
@@ -197,7 +197,9 @@ in
             after = [ "arbys-prep.service" ];
             script =
               let
-                linker = lib.getExe (pkgs.smfh or (pkgs.rustPlatform.buildRustPackage ./smfh.nix { }));
+                linker = lib.getExe (
+                  pkgs.smfh or (pkgs.callPackage (pkgs.rustPlatform.buildRustPackage ./smfh.nix { }))
+                );
               in
               ''
                 new_manifest=${manifest}