diff --git a/README.md b/README.md
index a32e3701d..79826d88e 100644
--- a/README.md
+++ b/README.md
@@ -752,12 +752,17 @@ Eio.Io Net Connection_failure Refused Unix_error (Connection refused, "connect",
 ```
 
 If we ran this using another backend, the `Unix_error` part might change.
-To avoid this problem, you can use `Eio.Exn.Backend.show` to hide the backend-specific part of errors:
+To avoid this problem, you can use `Eio.Exn.Backend.show`
 
 ```ocaml
 # Eio.Exn.Backend.show := false;;
 - : unit = ()
+```
+
+to hide the backend-specific part of errors:
 
+<!-- $MDX skip -->
+```ocaml
 # Eio_main.run @@ fun env ->
   let net = Eio.Stdenv.net env in
   Switch.run @@ fun sw ->
diff --git a/dune b/dune
index e3e6643d1..60c8c18b0 100644
--- a/dune
+++ b/dune
@@ -2,5 +2,4 @@
   (package eio_main)
   (deps (package eio_main) (env_var "EIO_BACKEND"))
   (preludes doc/prelude.ml)
-  (enabled_if (<> %{os_type} "Win32"))
   (files README.md))
diff --git a/eio_windows.opam b/eio_windows.opam
index e5b8b4a2d..62bf0628a 100644
--- a/eio_windows.opam
+++ b/eio_windows.opam
@@ -30,4 +30,4 @@ build: [
   ]
 ]
 dev-repo: "git+https://github.com/ocaml-multicore/eio.git"
-#available: [os-family = "windows"]
+#available: [os = "win32"]
diff --git a/lib_eio_windows/dune b/lib_eio_windows/dune
index cb4d98b69..879134229 100644
--- a/lib_eio_windows/dune
+++ b/lib_eio_windows/dune
@@ -1,12 +1,13 @@
 (library
  (name eio_windows)
  (public_name eio_windows)
- (library_flags :standard -ccopt -lbcrypt -ccopt -lntdll)
+ (library_flags :standard -cclib -lbcrypt -cclib -lntdll)
  (enabled_if (= %{os_type} "Win32"))
  (foreign_stubs
   (language c)
   (include_dirs ../lib_eio/unix/include)
   (names eio_windows_stubs eio_windows_cstruct_stubs))
+ (c_library_flags :standard -lbcrypt -lntdll)
  (libraries eio eio.unix eio.utils fmt))
 
 (rule