diff --git a/ocaml-lsp-server/test/e2e-new/dune b/ocaml-lsp-server/test/e2e-new/dune
index 8dcc1dd78..094fad3af 100644
--- a/ocaml-lsp-server/test/e2e-new/dune
+++ b/ocaml-lsp-server/test/e2e-new/dune
@@ -33,10 +33,14 @@
   ppx_expect.config
   ppx_expect.config_types
   ppx_inline_test.config)
+ (preprocessor_deps for_pp.sh)
  (preprocess
   (per_module
    ((action
-     (run sh %{dep:for_pp.sh} %{input-file}))
+     (run
+      sh ;; we don't rely on the shebang line for windoze
+      %{project_root}/ocaml-lsp-server/test/e2e-new/for_pp.sh
+      %{input-file}))
     for_pp)
    ((pps ppx_expect)
     action_extract