diff --git a/sc2/unit.py b/sc2/unit.py
index f679a2ed..bd1ec7b0 100644
--- a/sc2/unit.py
+++ b/sc2/unit.py
@@ -154,7 +154,7 @@ def race(self) -> Race:
         """Returns the race of the unit"""
         return Race(self._type_data._proto.race)
 
-    @property
+    @cached_property
     def tag(self) -> int:
         """Returns the unique tag of the unit."""
         return self._proto.tag