diff --git a/eio_windows.opam.template b/eio_windows.opam.template
index 888f6d9ab..8fe8e3252 100644
--- a/eio_windows.opam.template
+++ b/eio_windows.opam.template
@@ -1 +1 @@
-#available: [os-family = "windows"]
+#available: [os = "win32"]