diff --git a/lib/workerpool.py b/lib/workerpool.py
index 1f3bcd88bb27d16428ac5576921b7d88066a936f..d276b1837b8ca81265799ca40cbf5258f3e6bc39 100644
--- a/lib/workerpool.py
+++ b/lib/workerpool.py
@@ -180,7 +180,8 @@ class BaseWorker(threading.Thread, object):
             # Use same priority
             defer.priority = priority
 
-          logging.debug("Deferring task %r, new priority %s", defer.priority)
+          logging.debug("Deferring task %r, new priority %s",
+                        args, defer.priority)
 
           assert self._HasRunningTaskUnlocked()
         except: # pylint: disable-msg=W0702