diff --git a/epitran/test/test_zhuang.py b/epitran/test/test_zhuang.py
index e3fdac92..58b4cd01 100644
--- a/epitran/test/test_zhuang.py
+++ b/epitran/test/test_zhuang.py
@@ -21,7 +21,7 @@ def test_daengz(self):
 
     def test_lajmbwn(self):
         tr = self.epi.transliterate('lajmbwn')
-        self.assertEqual(tr, 'laɓɯn')
+        self.assertEqual(tr, 'laːɓɯn')
 
     def test_cinhyenz(self):
         tr = self.epi.transliterate('cinhyenz')