diff --git a/pyproject.toml b/pyproject.toml
index f8089debc..d4d6b2d22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ docstring-convention = "google"
 
 [tool.pyright]
 include = ["ops/*.py", "ops/_private/*.py",
+    "test/test_private.py",
     "test/test_infra.py",
     "test/test_jujuversion.py",
     "test/test_log.py",
diff --git a/test/test_private.py b/test/test_private.py
index e74507800..bf85db6a9 100644
--- a/test/test_private.py
+++ b/test/test_private.py
@@ -90,9 +90,7 @@ def test_parse_rfc3339(self):
             timeconv.parse_rfc3339('2021-99-99T04:36:22Z')
 
         with self.assertRaises(ValueError):
-            timeconv.parse_rfc3339(
-                timeconv.parse_rfc3339('2021-02-10T04:36:22.118970777x'))
+            timeconv.parse_rfc3339('2021-02-10T04:36:22.118970777x')
 
         with self.assertRaises(ValueError):
-            timeconv.parse_rfc3339(
-                timeconv.parse_rfc3339('2021-02-10T04:36:22.118970777-99:99'))
+            timeconv.parse_rfc3339('2021-02-10T04:36:22.118970777-99:99')