diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
index 6b4504c..37fc435 100644
--- a/demo/CMakeLists.txt
+++ b/demo/CMakeLists.txt
@@ -13,6 +13,8 @@ set(ads_demo_SRCS
     mainwindow.ui
     StatusDialog.cpp
     StatusDialog.ui
+    ImageViewer.cpp
+    RenderWidget.cpp
 	demo.qrc
 )
 add_executable(AdvancedDockingSystemDemo WIN32 ${ads_demo_SRCS})
diff --git a/src/AutoHideTab.h b/src/AutoHideTab.h
index affc0b0..ca8bb56 100644
--- a/src/AutoHideTab.h
+++ b/src/AutoHideTab.h
@@ -39,8 +39,7 @@ struct AutoHideTabPrivate;
 class CDockWidget;
 class CAutoHideSideBar;
 class CDockWidgetTab;
-struct SideTabIconLabelPrivate;
-struct DockContainerWidgetPrivate;
+class DockContainerWidgetPrivate;
 
 /**
  * A dock widget Side tab that shows a title or an icon.