diff --git a/tests/test_pages.py b/tests/test_pages.py
index 315569b9..6aeb1051 100644
--- a/tests/test_pages.py
+++ b/tests/test_pages.py
@@ -69,6 +69,7 @@ def to_item(self) -> dict:  # type: ignore
             }
 
     assert is_injectable(None) is False
+    assert is_injectable(type(None)) is False
     assert is_injectable(MyClass) is False
     assert is_injectable(MyClass()) is False
     assert is_injectable(MyItemPage) is True
diff --git a/web_poet/pages.py b/web_poet/pages.py
index b07b759b..99a0f315 100644
--- a/web_poet/pages.py
+++ b/web_poet/pages.py
@@ -35,10 +35,6 @@ class Injectable(abc.ABC, FieldsMixin):
     pass
 
 
-# NoneType is considered as injectable. Required for Optionals to work.
-Injectable.register(type(None))
-
-
 def is_injectable(cls: Any) -> bool:
     """Return True if ``cls`` is a class which inherits
     from :class:`~.Injectable`."""