diff --git a/lib/util/tests/genrand.c b/lib/util/tests/genrand.c
index 81c20bc386f..3987c33f25f 100644
--- a/lib/util/tests/genrand.c
+++ b/lib/util/tests/genrand.c
@@ -47,6 +47,8 @@ static bool test_generate_random_str(struct torture_context *tctx)
 	torture_assert_int_equal(tctx, strlen(r), 10, "right length generated");
 	r = generate_random_str(mem_ctx, 5);
 	torture_assert_int_equal(tctx, strlen(r), 5, "right length generated");
+
+	TALLOC_FREE(mem_ctx);
 	return true;
 }