diff --git a/tests/test_1doc.py b/tests/test_1doc.py
index e5595c92..de05c00a 100644
--- a/tests/test_1doc.py
+++ b/tests/test_1doc.py
@@ -508,7 +508,7 @@ def test_unify(self):
         with self.assertRaises(WDL.Error.ValidationError):
             doc = WDL.parse_document("""
             workflow unify {
-                Array[Pair[String,String]] bogus = [("a","b"), "c"]
+                Array[Pair[String,String]] bogus = [("a","b"), ("c",("d","e"))]
             }
             """)
             doc.typecheck()