diff --git a/tasksched_fast.py b/tasksched_fast.py
index 82dc6a2..6e89210 100644
--- a/tasksched_fast.py
+++ b/tasksched_fast.py
@@ -17,7 +17,7 @@ def add(self, tsk):
         self.ntasks += 1
 
     def _task_by_id(self, id):
-        return self._tasks_by_id(id - 1)
+        return self._tasks_by_id[id - 1]
 
     def _task_by_rank(self, rank):
         return self._tasks_by_rank[rank - 1]