diff --git a/src/barchart/qbarseries.cpp b/src/barchart/qbarseries.cpp
index 236dfbe..bf164cb 100644
--- a/src/barchart/qbarseries.cpp
+++ b/src/barchart/qbarseries.cpp
@@ -22,6 +22,7 @@
 #include "qbarseries.h"
 #include "qbarset.h"
 #include "barchartmodel_p.h"
+#include <QAbstractItemModel>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
diff --git a/src/piechart/qpieseries.cpp b/src/piechart/qpieseries.cpp
index f874507..9554a7c 100644
--- a/src/piechart/qpieseries.cpp
+++ b/src/piechart/qpieseries.cpp
@@ -22,6 +22,7 @@
 #include "qpieseriesprivate_p.h"
 #include "qpieslice.h"
 #include "pieslicedata_p.h"
+#include <QAbstractItemModel>
 #include <QDebug>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
diff --git a/src/qseries.h b/src/qseries.h
index e48529e..073fb21 100644
--- a/src/qseries.h
+++ b/src/qseries.h
@@ -23,9 +23,12 @@
 
 #include <qchartglobal.h>
 #include <QObject>
-#include <QAbstractItemModel>
+//#include <QAbstractItemModel>
 #include <QPen>
 
+class QAbstractItemModel;
+class QModelIndex;
+
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
 class QTCOMMERCIALCHART_EXPORT QSeries : public QObject
diff --git a/src/xychart/qxyseries.cpp b/src/xychart/qxyseries.cpp
index 19580bd..2e1e0c8 100644
--- a/src/xychart/qxyseries.cpp
+++ b/src/xychart/qxyseries.cpp
@@ -19,6 +19,7 @@
 ****************************************************************************/
 
 #include "qxyseries.h"
+#include <QAbstractItemModel>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE