diff --git a/tests/forms_tests/field_tests/test_jsonfield.py b/tests/forms_tests/field_tests/test_jsonfield.py
index 892a23a6a7..915b180d0c 100644
--- a/tests/forms_tests/field_tests/test_jsonfield.py
+++ b/tests/forms_tests/field_tests/test_jsonfield.py
@@ -16,8 +16,8 @@ class JSONFieldTest(SimpleTestCase):
 
     def test_valid_empty(self):
         field = JSONField(required=False)
-        value = field.clean('')
-        self.assertIsNone(value)
+        self.assertIsNone(field.clean(''))
+        self.assertIsNone(field.clean(None))
 
     def test_invalid(self):
         field = JSONField()
diff --git a/tests/forms_tests/field_tests/test_uuidfield.py b/tests/forms_tests/field_tests/test_uuidfield.py
index 3f902643e0..e1c1698d02 100644
--- a/tests/forms_tests/field_tests/test_uuidfield.py
+++ b/tests/forms_tests/field_tests/test_uuidfield.py
@@ -19,8 +19,8 @@ class UUIDFieldTest(SimpleTestCase):
 
     def test_uuidfield_2(self):
         field = UUIDField(required=False)
-        value = field.clean('')
-        self.assertIsNone(value)
+        self.assertIsNone(field.clean(''))
+        self.assertIsNone(field.clean(None))
 
     def test_uuidfield_3(self):
         field = UUIDField()