--- a/src/internet/model/ipv6-pmtu-cache.cc	Fri Sep 26 12:44:13 2014 -0700
+++ b/src/internet/model/ipv6-pmtu-cache.cc	Fri Sep 26 15:51:00 2014 -0700
@@ -22,9 +22,9 @@
 #include "ns3/log.h"
 #include "ns3/simulator.h"
 
-NS_LOG_COMPONENT_DEFINE ("Ipv6PmtuCache");
+namespace ns3 {
 
-namespace ns3 {
+NS_LOG_COMPONENT_DEFINE ("Ipv6PmtuCache");
 
 NS_OBJECT_ENSURE_REGISTERED (Ipv6PmtuCache);