diff --git a/src/python/oftest/dataplane.py b/src/python/oftest/dataplane.py
index 12dcfce..740e6aa 100644
--- a/src/python/oftest/dataplane.py
+++ b/src/python/oftest/dataplane.py
@@ -126,7 +126,7 @@
 
     def recv(self):
         (timestamp, pkt) = next(self.pcap)
-        return (pkt, timestamp)
+        return (pkt[:], timestamp)
 
     def send(self, packet):
         return self.pcap.inject(packet, len(packet))