diff --git a/test/own_tmp.ml b/test/own_tmp.ml
index 4dda3a77..a3f2453b 100644
--- a/test/own_tmp.ml
+++ b/test/own_tmp.ml
@@ -84,6 +84,10 @@ let release () =
   if Unix.getpid () = owner && not !released then begin
     released := true;
     remove dir;
+    (* Twice, because a child still exiting — a daemon's clang, a program
+       the test just signalled — can write between one pass's [readdir] and
+       its [rmdir], and a check that fails on that is a flake. *)
+    if Sys.file_exists dir then remove dir;
     match leftovers () with
     | [] -> ()
     | left ->