diff --git a/sinch/core/pagination.py b/sinch/core/pagination.py
index b4c4ac6..ff4495e 100644
--- a/sinch/core/pagination.py
+++ b/sinch/core/pagination.py
@@ -45,7 +45,7 @@ def _calculate_next_page(self) -> None:
 
     @classmethod
     @abstractmethod
-    def _initialize(cls, sinch, endpoint: HTTPEndpoint) -> 'Paginator':
+    def _initialize(cls, sinch: 'ClientBase', endpoint: HTTPEndpoint) -> 'Paginator':
         pass
 
 
@@ -56,7 +56,7 @@ def __init__(self, paginator: Paginator):
     def __iter__(self) -> 'PageIterator':
         return self
 
-    def __next__(self):
+    def __next__(self) -> Paginator:
         if self.paginator.has_next_page:
             return self.paginator.next_page()
         else: