diff --git a/src/tests/queue.py b/src/tests/queue.py
index cc5b14ea..71863b54 100644
--- a/src/tests/queue.py
+++ b/src/tests/queue.py
@@ -18,6 +18,7 @@ class ObjQueue(object):
     }
 
     def __init__(self, tag=b'obj'):
+        self.curSize = 0
         context = zmq.Context()
         self.socket = context.socket(zmq.SUB)
         self.socket.connect('tcp://localhost:5556')