diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index 4c39ff13b..503c3dadd 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -357,6 +357,7 @@ def check_ml():
     rmf('hello.cmo')
     rmf('hello.cmx')
     rmf('a.out')
+    t.__del__()
     find_ml_lib()
     find_ocaml_find()