diff --git a/trello/__init__.py b/trello/__init__.py
index 89a60b59..32e3a992 100644
--- a/trello/__init__.py
+++ b/trello/__init__.py
@@ -476,7 +476,7 @@ def description(self):
         return self.desc
 
     @property
-    def date_last_activity(self) -> datetime:
+    def date_last_activity(self):
         return self.dateLastActivity
 
     @description.setter