diff --git a/tests/test_pwd.py b/tests/test_pwd.py
index e3390dd..ff8064c 100644
--- a/tests/test_pwd.py
+++ b/tests/test_pwd.py
@@ -743,6 +743,7 @@ def test__pl_general_verb(self):
             ("tuna's", "tuna's"),
             ("TUNA's", "TUNA's"),
             ("bad", False),
+            ("'", False),
             pytest.param(
                 "JOHN's",
                 "JOHNS'",