diff --git a/swh/graphql/resolvers/person.py b/swh/graphql/resolvers/person.py
index 11265f0..2f87225 100644
--- a/swh/graphql/resolvers/person.py
+++ b/swh/graphql/resolvers/person.py
@@ -1,74 +1,76 @@
 # Copyright (C) 2022 The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from typing import List
+from typing import List, Optional
+
+from swh.model.model import Person as StoragePerson
 
 from .base_connection import BaseList
 from .base_node import BaseNode
 from .release import BaseReleaseNode
 from .revision import BaseRevisionNode
 
 
 class Person(BaseNode):
     pass
 
 
-def get_person_list(person) -> List[Person]:
+def get_person_list(person: Optional[StoragePerson]) -> List[StoragePerson]:
     return [person] if person else []
 
 
 class RevisionAuthorList(BaseList):
     """
     List of revision authors
     """
 
     obj: BaseRevisionNode
 
     _node_class = Person
 
-    def _get_results(self) -> List[Person]:
+    def _get_results(self) -> List[StoragePerson]:
         """
         Author is a single object in the current data model,
         return it as a list to support future evolutions
 
         No backend fetching required as the data exists in
         the parent object (revision)
         """
 
         return get_person_list(self.obj.author)
 
 
 class RevisionCommitterList(BaseList):
     obj: BaseRevisionNode
 
     _node_class = Person
 
-    def _get_results(self) -> List[Person]:
+    def _get_results(self) -> List[StoragePerson]:
         """
         Committer is a single object in the current data model,
         return it as a list to support future evolutions
 
         No backend fetching required as the data exists in
         the parent object (revision)
         """
 
         return get_person_list(self.obj.committer)
 
 
 class ReleaseAuthorList(BaseList):
     obj: BaseReleaseNode
 
     _node_class = Person
 
-    def _get_results(self) -> List[Person]:
+    def _get_results(self) -> List[StoragePerson]:
         """
         Author is a single object in the current data model,
         return it as a list to support future evolutions
 
         No backend fetching required as the data exists in
         the parent object (release)
         """
 
         return get_person_list(self.obj.author)