diff --git a/test.js b/test.js
index 1e46808..3ca7df2 100644
--- a/test.js
+++ b/test.js
@@ -20,3 +20,7 @@ test('ignores control characters', t => {
 	t.is(m(String.fromCharCode(159)), 0);
 	t.is(m('\u001b'), 0);
 });
+
+test.failing('handles combining characters', t => {
+	t.is(m('x\u0300'), 1);
+});