diff --git a/otherlibs/stdune/src/proc.ml b/otherlibs/stdune/src/proc.ml
index c207ce0d81a..b904e2802b2 100644
--- a/otherlibs/stdune/src/proc.ml
+++ b/otherlibs/stdune/src/proc.ml
@@ -11,7 +11,7 @@ let restore_cwd_and_execve prog argv ~env =
   (* run at_exit before changing the working directory *)
   Stdlib.do_at_exit ();
   Sys.chdir (Path.External.to_string Path.External.initial_cwd);
-  if Sys.win32
+  if Sys.win32 || Platform.OS.value = Platform.OS.Haiku
   then (
     let pid = Unix.create_process_env prog argv env Unix.stdin Unix.stdout Unix.stderr in
     match snd (Unix.waitpid [] pid) with