diff --git a/pkgs/build-support/docker/default.nix b/pkgs/build-support/docker/default.nix
index ef17a3f4e58a..4b20c5624607 100644
--- a/pkgs/build-support/docker/default.nix
+++ b/pkgs/build-support/docker/default.nix
@@ -283,6 +283,7 @@ rec {
     let
       storePathToLayer = substituteAll
       { inherit (stdenv) shell;
+        isExecutable = true;
         src = ./store-path-to-layer.sh;
       };
     in