diff --git a/AdvancedDockingSystem/include/ads/ContainerWidget.h b/AdvancedDockingSystem/include/ads/ContainerWidget.h
index f596f32..cb18624 100644
--- a/AdvancedDockingSystem/include/ads/ContainerWidget.h
+++ b/AdvancedDockingSystem/include/ads/ContainerWidget.h
@@ -2,6 +2,7 @@
 #define ADS_CONTAINERWIDGET_H
 
 #include <QList>
+#include <QHash>
 #include <QPointer>
 #include <QFrame>
 class QPoint;
@@ -143,9 +144,7 @@ private:
 	// Helper lookup maps, restricted to this container.
 	QHash<int, SectionContent::WeakPtr> _scLookupMapById;
 	QHash<QString, SectionContent::WeakPtr> _scLookupMapByName;
-
 	QHash<int, SectionWidget*> _swLookupMapById;
-	//QHash<ContainerWidget*, QHash<int, SectionWidget*> > _swLookupMapByContainer; // TODO Do we really need it?
 
 
 	// Layout stuff
diff --git a/AdvancedDockingSystem/include/ads/Internal.h b/AdvancedDockingSystem/include/ads/Internal.h
index ccd996a..b97e838 100644
--- a/AdvancedDockingSystem/include/ads/Internal.h
+++ b/AdvancedDockingSystem/include/ads/Internal.h
@@ -6,6 +6,11 @@
 
 #include "ads/API.h"
 
+#if QT_VERSION >= 0x050000
+#else
+#include "ads/SectionContent.h"
+#endif
+
 #define SCLookupMapById(X)   X->_scLookupMapById
 #define SCLookupMapByName(X) X->_scLookupMapByName
 #define SWLookupMapById(X)   X->_swLookupMapById