diff --git a/generate/templates/device.py.in b/generate/templates/device.py.in
index 5a143d5..bc54936 100644
--- a/generate/templates/device.py.in
+++ b/generate/templates/device.py.in
@@ -20,8 +20,10 @@ class PingDevice(object):
     _{{field}} = None
 {% endfor%}
 
-    _input_buffer = deque()
     def __init__(self, payload_dict=None):
+        ## Receive buffer for this device's io stream.
+        self._input_buffer = deque()
+
         my_payload_dict = {}
         if payload_dict is not None:
             my_payload_dict = definitions.payload_dict_common.copy()