diff --git a/ChangeLog b/ChangeLog
index 109bb1eb..f89d0a2d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-18  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
+
+	Made DHTBucketTreeNode non-copyable.
+	* src/DHTBucketTree.h
+
 2010-11-18  Tatsuhiro Tsujikawa  <t-tujikawa@users.sourceforge.net>
 
 	Enter 'end game' mode from the beginning when getting torrent
diff --git a/src/DHTBucketTree.h b/src/DHTBucketTree.h
index 48c47a8c..46d32b2c 100644
--- a/src/DHTBucketTree.h
+++ b/src/DHTBucketTree.h
@@ -75,6 +75,10 @@ public:
   // call.
   void split();
 private:
+  // Do not allow copying
+  DHTBucketTreeNode(const DHTBucketTreeNode&);
+  DHTBucketTreeNode& operator=(const DHTBucketTreeNode&);
+
   // Reset relation of children and minId_ and maxId_.
   void resetRelation();
   void setParent(DHTBucketTreeNode* parent) { parent_ = parent; }