diff --git a/injector/__init__.py b/injector/__init__.py
index e53b762..0d49dd7 100644
--- a/injector/__init__.py
+++ b/injector/__init__.py
@@ -1263,9 +1263,8 @@ def _recreate_annotated_origin(annotated_type: Any) -> Any:
         if only_explicit_bindings and _inject_marker not in metadata or _noinject_marker in metadata:
             del bindings[k]
         elif _is_specialization(v, Union) or _is_new_union_type(v):
-            # We don't treat Optional parameters in any special way at the moment.
             union_members = v.__args__
-            new_members = tuple(set(union_members) - {type(None)})
+            new_members = tuple(set(union_members))
             # mypy stared complaining about this line for some reason:
             #     error: Variable "new_members" is not valid as a type
             new_union = Union[new_members]  # type: ignore
diff --git a/injector_test.py b/injector_test.py
index ade7ba9..f4b50bf 100644
--- a/injector_test.py
+++ b/injector_test.py
@@ -1761,6 +1761,14 @@ def function(a: Inject[Inject[int]]) -> None:
     assert get_bindings(function) == {'a': int}
 
 
+    # This should correctly resolve str | None
+    @inject
+    def function12(a: str | None):
+        pass
+
+    assert get_bindings(function12) == {'a': str | None}
+
+
 # Tests https://github.com/alecthomas/injector/issues/202
 @pytest.mark.skipif(sys.version_info < (3, 10), reason="Requires Python 3.10+")
 def test_get_bindings_for_pep_604():
@@ -1768,7 +1776,7 @@ def test_get_bindings_for_pep_604():
     def function1(a: int | None) -> None:
         pass
 
-    assert get_bindings(function1) == {'a': int}
+    assert get_bindings(function1) == {'a': Union[int, None]}
 
     @inject
     def function1(a: int | str) -> None: