diff --git a/src/trust-tree-scene.hpp b/src/trust-tree-scene.hpp
index 90be20e..c8c21c6 100644
--- a/src/trust-tree-scene.hpp
+++ b/src/trust-tree-scene.hpp
@@ -8,8 +8,8 @@
  * Author: Yingdi Yu <yingdi@cs.ucla.edu>
  */
 
-#ifndef CHRONOS_TRUST_TREE_SCENE_HPP
-#define CHRONOS_TRUST_TREE_SCENE_HPP
+#ifndef CHRONOCHAT_TRUST_TREE_SCENE_HPP
+#define CHRONOCHAT_TRUST_TREE_SCENE_HPP
 
 #include <QtGui/QGraphicsScene>
 #include <QColor>
@@ -22,7 +22,7 @@
 
 class QGraphicsTextItem;
 
-namespace chronos {
+namespace chronochat {
 
 class TrustTreeScene : public QGraphicsScene
 {
@@ -32,16 +32,16 @@
   TrustTreeScene(QWidget* parent = 0);
 
   void
-  plotTrustTree(chronos::TrustTreeNodeList& nodeList);
+  plotTrustTree(chronochat::TrustTreeNodeList& nodeList);
 
 private:
   void
-  plotEdge(const chronos::TrustTreeNodeList& nodeList, int nodeSize);
+  plotEdge(const chronochat::TrustTreeNodeList& nodeList, int nodeSize);
 
   void
-  plotNode(const chronos::TrustTreeNodeList& nodeList, int nodeSize);
+  plotNode(const chronochat::TrustTreeNodeList& nodeList, int nodeSize);
 };
 
-} // namespace chronos
+} // namespace chronochat
 
-#endif // CHRONOS_TRUST_TREE_SCENE_HPP
+#endif // CHRONOCHAT_TRUST_TREE_SCENE_HPP