--- a/src/core/attribute-accessor-helper.h	Mon Mar 24 13:33:56 2008 -0700
+++ b/src/core/attribute-accessor-helper.h	Mon Mar 24 13:57:07 2008 -0700
@@ -20,6 +20,8 @@
 #ifndef ATTRIBUTE_ACCESSOR_HELPER_H
 #define ATTRIBUTE_ACCESSOR_HELPER_H
 
+#include "attribute.h"
+
 namespace ns3 {
 
 template <typename V, typename T1>