diff -r 28f71af02b69 Lib/asyncio/unix_events.py
--- a/Lib/asyncio/unix_events.py	Wed Nov 13 14:17:30 2013 +0100
+++ b/Lib/asyncio/unix_events.py	Wed Nov 13 16:02:55 2013 +0100
@@ -593,11 +593,10 @@ class FastChildWatcher(BaseChildWatcher)
     (O(1) each time a child terminates).
     """
     def __init__(self, loop):
-        super().__init__(loop)
-
         self._lock = threading.Lock()
         self._zombies = {}
         self._forks = 0
+        super().__init__(loop)
 
     def close(self):
         super().close()