diff --git a/tests/tbf/TbfTest.cpp b/tests/tbf/TbfTest.cpp
index 585496a..116b234 100644
--- a/tests/tbf/TbfTest.cpp
+++ b/tests/tbf/TbfTest.cpp
@@ -622,6 +622,8 @@
 
 	fprintf(stderr, "=== end %s ===\n", __func__);
 
+	/* Restore MS release timeout to 0 to make sure it is freed immediately: */
+	ms_set_timeout(ms, 0);
 	TALLOC_FREE(the_pcu);
 }