diff -r 3adf94e68d82 src/common/packet.cc
--- a/src/common/packet.cc	Wed Mar 17 16:58:32 2010 +0000
+++ b/src/common/packet.cc	Thu Mar 18 12:07:23 2010 +1100
@@ -1110,10 +1110,14 @@
   
   NS_TEST_EXPECT_MSG_EQ (packet->GetSize (), 11, "trivial");
 
-  std::string msg = std::string (reinterpret_cast<const char *>(packet->PeekData ()),
-                                 packet->GetSize ());
-  NS_TEST_EXPECT_MSG_EQ (msg, "hello world", "trivial");
-
+  {
+    uint8_t *temp = new uint8_t[packet->GetSize ()];
+    packet->CopyData (temp, packet->GetSize ());
+    std::string msg = std::string (reinterpret_cast<const char *>(temp),
+                                   packet->GetSize ());
+    NS_TEST_EXPECT_MSG_EQ (msg, "hello world", "trivial");
+    delete[] temp;
+  }
 
   Ptr<const Packet> p = Create<Packet> (1000);