diff --git a/src/start-chat-dialog.cpp b/src/start-chat-dialog.cpp
index f79e4a2..8aa7965 100644
--- a/src/start-chat-dialog.cpp
+++ b/src/start-chat-dialog.cpp
@@ -8,9 +8,11 @@
  * Author: Yingdi Yu <yingdi@cs.ucla.edu>
  */
 
-#include "start-chat-dialog.h"
+#include "start-chat-dialog.hpp"
 #include "ui_start-chat-dialog.h"
 
+namespace chronos {
+
 StartChatDialog::StartChatDialog(QWidget *parent)
   : QDialog(parent)
   , ui(new Ui::StartChatDialog)
@@ -49,6 +51,8 @@
   this->close();
 }
 
+} // namespace chronos
+
 #if WAF
 #include "start-chat-dialog.moc"
 #include "start-chat-dialog.cpp.moc"