diff --git a/{{cookiecutter.project_name}}/Applications/{{cookiecutter.app_name}}App/q{{cookiecutter.app_name}}AppMainWindow.cxx b/{{cookiecutter.project_name}}/Applications/{{cookiecutter.app_name}}App/q{{cookiecutter.app_name}}AppMainWindow.cxx
index 4e29922..17f7953 100644
--- a/{{cookiecutter.project_name}}/Applications/{{cookiecutter.app_name}}App/q{{cookiecutter.app_name}}AppMainWindow.cxx
+++ b/{{cookiecutter.project_name}}/Applications/{{cookiecutter.app_name}}App/q{{cookiecutter.app_name}}AppMainWindow.cxx
@@ -28,6 +28,7 @@
 #include "qSlicerAboutDialog.h"
 #include "qSlicerMainWindow_p.h"
 #include "qSlicerModuleSelectorToolBar.h"
+#include "qMRMLWidget.h"
 
 //-----------------------------------------------------------------------------
 // q{{cookiecutter.app_name}}AppMainWindowPrivate methods