diff -r bdaa5571f8ca -r dc6216aee85c src/mem/packet_queue.cc
--- a/src/mem/packet_queue.cc	Fri Aug 03 17:18:02 2012 +0100
+++ b/src/mem/packet_queue.cc	Fri Aug 03 17:31:34 2012 +0100
@@ -105,7 +105,8 @@
 void
 PacketQueue::schedSendTiming(PacketPtr pkt, Tick when, bool send_as_snoop)
 {
-    assert(when > curTick());
+    // we can still send a packet before the end of this tick
+    assert(when >= curTick());
 
     // express snoops should never be queued
     assert(!pkt->isExpressSnoop());