diff --git a/async_lru/__init__.py b/async_lru/__init__.py
index 447e9cd..3c75c69 100644
--- a/async_lru/__init__.py
+++ b/async_lru/__init__.py
@@ -172,23 +172,24 @@ def _task_done_callback(
     ) -> None:
         self.__tasks.discard(task)
 
+        cache = self.__cache
+
         if task.cancelled():
             fut.cancel()
-            self.__cache.pop(key, None)
+            cache.pop(key, None)
             return
 
         exc = task.exception()
         if exc is not None:
             fut.set_exception(exc)
-            self.__cache.pop(key, None)
+            cache.pop(key, None)
             return
 
-        cache_item = self.__cache.get(key)
-        if self.__ttl is not None and cache_item is not None:
+        cache_item = cache.get(key)
+        ttl = self.__ttl
+        if ttl is not None and cache_item is not None:
             loop = asyncio.get_running_loop()
-            cache_item.later_call = loop.call_later(
-                self.__ttl, self.__cache.pop, key, None
-            )
+            cache_item.later_call = loop.call_later(ttl, cache.pop, key, None)
 
         fut.set_result(task.result())