diff --git a/lib/workerpool.py b/lib/workerpool.py
index 91fb1060acf5a25055e370d299dd99189f2401b4..fbf562d28365b802962867b6273efaf7e5312c07 100644
--- a/lib/workerpool.py
+++ b/lib/workerpool.py
@@ -336,8 +336,8 @@ class WorkerPool(object):
       assert compat.all(isinstance(prio, (int, long)) for prio in priority)
       assert len(tasks) == len(priority)
 
-      for args, priority in zip(tasks, priority):
-        self._AddTaskUnlocked(args, priority)
+      for args, prio in zip(tasks, priority):
+        self._AddTaskUnlocked(args, prio)
     finally:
       self._lock.release()