diff --git a/flake.nix b/flake.nix
index fabc3e5..a274254 100644
--- a/flake.nix
+++ b/flake.nix
@@ -43,10 +43,9 @@
                   prootPatched
                 ];
               };
-              # resolve these now so we can hardcode into the runner
               appBinGuess = "${drv}/bin";
-              prootBin = "${prootPatched}/bin/proot";
-              PROOT_REL = "/nix/store/${builtins.baseNameOf (builtins.dirOf prootBin)}/bin/proot";
+              prootStoreBase = builtins.baseNameOf prootPatched;
+              PROOT_REL = "/nix/store/${prootStoreBase}/bin/proot";
             in
             pkgs.stdenvNoCC.mkDerivation {
               name = "myApp.run";