diff --git a/tests/test_basic.py b/tests/test_basic.py
index 3f7352879..ebbe162e6 100644
--- a/tests/test_basic.py
+++ b/tests/test_basic.py
@@ -258,9 +258,11 @@ def cli(f):
 
 @pytest.mark.parametrize(
     ("value", "expect"),
-    chain(
-        ((x, "True") for x in ("1", "true", "t", "yes", "y", "on")),
-        ((x, "False") for x in ("0", "false", "f", "no", "n", "off")),
+    tuple(
+        chain(
+            ((x, "True") for x in ("1", "true", "t", "yes", "y", "on")),
+            ((x, "False") for x in ("0", "false", "f", "no", "n", "off")),
+        )
     ),
 )
 def test_boolean_conversion(runner, value, expect):