diff --git a/src/areachart/qareaseries.h b/src/areachart/qareaseries.h
index 3eb7c42..3210347 100644
--- a/src/areachart/qareaseries.h
+++ b/src/areachart/qareaseries.h
@@ -1,8 +1,8 @@
 #ifndef QAREASERIES_H_
 #define QAREASERIES_H_
 
-#include "qchartglobal.h"
-#include "qseries.h"
+#include <qchartglobal.h>
+#include <qseries.h>
 #include <QDebug>
 #include <QPen>
 #include <QBrush>
diff --git a/src/axis/qchartaxis.h b/src/axis/qchartaxis.h
index 3f78f4b..c453a7c 100644
--- a/src/axis/qchartaxis.h
+++ b/src/axis/qchartaxis.h
@@ -1,8 +1,8 @@
 #ifndef QCHARTAXIS_H_
 #define QCHARTAXIS_H_
 
-#include "qchartglobal.h"
-#include "qchartaxiscategories.h"
+#include <qchartglobal.h>
+#include <qchartaxiscategories.h>
 #include <QPen>
 #include <QFont>
 
diff --git a/src/axis/qchartaxiscategories.h b/src/axis/qchartaxiscategories.h
index e77316f..301be40 100644
--- a/src/axis/qchartaxiscategories.h
+++ b/src/axis/qchartaxiscategories.h
@@ -1,6 +1,6 @@
 #ifndef QCHARTAXISCATEGORIES_H_
 #define QCHARTAXISCATEGORIES_H_
-#include "qchartglobal.h"
+#include <qchartglobal.h>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
diff --git a/src/barchart/qbarseries.h b/src/barchart/qbarseries.h
index 6adf571..25b49ad 100644
--- a/src/barchart/qbarseries.h
+++ b/src/barchart/qbarseries.h
@@ -1,7 +1,7 @@
 #ifndef BARSERIES_H
 #define BARSERIES_H
 
-#include "qseries.h"
+#include <qseries.h>
 #include <QStringList>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
diff --git a/src/barchart/qpercentbarseries.h b/src/barchart/qpercentbarseries.h
index cbcafe1..b2a6d13 100644
--- a/src/barchart/qpercentbarseries.h
+++ b/src/barchart/qpercentbarseries.h
@@ -2,7 +2,7 @@
 #define PERCENTBARSERIES_H
 
 #include <QStringList>
-#include "qbarseries.h"
+#include <qbarseries.h>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
diff --git a/src/barchart/qstackedbarseries.h b/src/barchart/qstackedbarseries.h
index e1b796e..8a77ea6 100644
--- a/src/barchart/qstackedbarseries.h
+++ b/src/barchart/qstackedbarseries.h
@@ -2,7 +2,7 @@
 #define STACKEDBARSERIES_H
 
 #include <QStringList>
-#include "qbarseries.h"
+#include <qbarseries.h>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
 
diff --git a/src/linechart/qlineseries.h b/src/linechart/qlineseries.h
index 9959af7..c287ba8 100644
--- a/src/linechart/qlineseries.h
+++ b/src/linechart/qlineseries.h
@@ -1,8 +1,8 @@
 #ifndef QLINESERIES_H_
 #define QLINESERIES_H_
 
-#include "qchartglobal.h"
-#include "qxyseries.h"
+#include <qchartglobal.h>
+#include <qxyseries.h>
 #include <QDebug>
 #include <QPen>
 #include <QBrush>
diff --git a/src/qchartview.h b/src/qchartview.h
index 0e6d3ea..c7d286f 100644
--- a/src/qchartview.h
+++ b/src/qchartview.h
@@ -1,10 +1,10 @@
 #ifndef QCHARTWIDGET_H
 #define QCHARTWIDGET_H
 
-#include "qchartglobal.h"
-#include "qchartaxis.h"
-#include "qseries.h"
-#include "qchart.h"
+#include <qchartglobal.h>
+#include <qchartaxis.h>
+#include <qseries.h>
+#include <qchart.h>
 #include <QGraphicsView>
 
 class QGraphicsScene;
diff --git a/src/qlegend.h b/src/qlegend.h
index 53a9c6b..99ede81 100644
--- a/src/qlegend.h
+++ b/src/qlegend.h
@@ -1,8 +1,8 @@
 #ifndef QLEGEND_H
 #define QLEGEND_H
 
-#include "qchartglobal.h"
-#include "qseries.h"
+#include <qchartglobal.h>
+#include <qseries.h>
 #include <QGraphicsObject>
 
 QTCOMMERCIALCHART_BEGIN_NAMESPACE
diff --git a/src/qseries.h b/src/qseries.h
index 4c2c77a..6631165 100644
--- a/src/qseries.h
+++ b/src/qseries.h
@@ -1,7 +1,7 @@
 #ifndef QSERIES_H
 #define QSERIES_H
 
-#include "qchartglobal.h"
+#include <qchartglobal.h>
 #include <QObject>
 #include <QAbstractItemModel>
 #include <QPen>
diff --git a/src/scatterseries/qscatterseries.h b/src/scatterseries/qscatterseries.h
index 851fee1..1010547 100644
--- a/src/scatterseries/qscatterseries.h
+++ b/src/scatterseries/qscatterseries.h
@@ -1,8 +1,8 @@
 #ifndef QSCATTERSERIES_H
 #define QSCATTERSERIES_H
 
-#include "qchartglobal.h"
-#include "qxyseries.h"
+#include <qchartglobal.h>
+#include <qxyseries.h>
 #include <QRectF>
 #include <QColor>
 
diff --git a/src/splinechart/qsplineseries.h b/src/splinechart/qsplineseries.h
index 8a454fc..1e77099 100644
--- a/src/splinechart/qsplineseries.h
+++ b/src/splinechart/qsplineseries.h
@@ -1,9 +1,9 @@
 #ifndef QSPLINESERIES_H
 #define QSPLINESERIES_H
 
-#include "qchartglobal.h"
+#include <qchartglobal.h>
 #include <QtGlobal>
-#include "qlineseries.h"
+#include <qlineseries.h>
 #include <QList>
 #include <QPointF>
 
diff --git a/src/xychart/qxyseries.h b/src/xychart/qxyseries.h
index 4bb3cbc..fdc0d0f 100644
--- a/src/xychart/qxyseries.h
+++ b/src/xychart/qxyseries.h
@@ -1,8 +1,8 @@
 #ifndef QXYSERIES_H_
 #define QXYSERIES_H_
 
-#include "qchartglobal.h"
-#include "qseries.h"
+#include <qchartglobal.h>
+#include <qseries.h>
 #include <QDebug>
 #include <QPen>
 #include <QBrush>