diff --git a/open_feature/open_feature_client.py b/open_feature/open_feature_client.py
index a6dbdb3..c8f89be 100644
--- a/open_feature/open_feature_client.py
+++ b/open_feature/open_feature_client.py
@@ -365,7 +365,7 @@ class OpenFeatureClient:
         
     def __extract_evaluation_options(
         self, flag_evaluation_options: typing.Any
-    ) -> typing.Tuple(typing.List[Hook], MappingProxyType):
+    ) -> typing.Tuple[typing.List[Hook], MappingProxyType]:
         evaluation_hooks: typing.List[Hook] = []
         hook_hints: dict = {}