diff --git a/lib_eio/unix/dune b/lib_eio/unix/dune
index d067e815..e8afa88d 100644
--- a/lib_eio/unix/dune
+++ b/lib_eio/unix/dune
@@ -1,6 +1,7 @@
 (library
  (name eio_unix)
  (public_name eio.unix)
+ (public_headers include/fork_action.h)
  (foreign_stubs
   (language c)
   (include_dirs include)