diff --git a/jedi/inference/gradual/typing.py b/jedi/inference/gradual/typing.py
index cfdce3ea..3b3cdf17 100644
--- a/jedi/inference/gradual/typing.py
+++ b/jedi/inference/gradual/typing.py
@@ -142,7 +142,6 @@ class TypingValueWithIndex(BaseTypingValueWithGenerics):
 
 class ProxyTypingValue(BaseTypingValue):
     index_class = TypingValueWithIndex
-    py__simple_getitem__ = None
 
     def with_generics(self, generics_tuple):
         return self.index_class.create_cached(
diff --git a/test/completion/pep0484_typing.py b/test/completion/pep0484_typing.py
index 32d00932..9104ca11 100644
--- a/test/completion/pep0484_typing.py
+++ b/test/completion/pep0484_typing.py
@@ -332,6 +332,9 @@ def union4(x: U[int, str]):
     #? int() str()
     x
 
+#? typing.Optional
+typing.Optional[0]
+
 # -------------------------
 # Type Vars
 # -------------------------