diff --git a/src/graphs2d/areachart/qareaseries.cpp b/src/graphs2d/areachart/qareaseries.cpp
index dd8007b0..c6dd06f1 100644
--- a/src/graphs2d/areachart/qareaseries.cpp
+++ b/src/graphs2d/areachart/qareaseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/qabstractseries_p.h"
 #include <QtGraphs/qareaseries.h>
 #include <private/qareaseries_p.h>
 #include <private/qgraphsview_p.h>
@@ -366,6 +367,8 @@ void QAreaSeries::setLowerSeries(QXYSeries *newLowerSeries)
     emit lowerSeriesChanged();
 }
 
-QAreaSeriesPrivate::QAreaSeriesPrivate() {}
+QAreaSeriesPrivate::QAreaSeriesPrivate()
+    : QAbstractSeriesPrivate(QAbstractSeries::SeriesType::Area)
+{}
 
 QT_END_NAMESPACE
diff --git a/src/graphs2d/barchart/qbarseries.cpp b/src/graphs2d/barchart/qbarseries.cpp
index 8cb5d9f5..99d84fcd 100644
--- a/src/graphs2d/barchart/qbarseries.cpp
+++ b/src/graphs2d/barchart/qbarseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/qabstractseries_p.h"
 #include <QtGraphs/qabstractseries.h>
 #include <QtGraphs/qbarseries.h>
 #include <QtGraphs/qbarset.h>
@@ -1146,16 +1147,17 @@ void QBarSeries::setBarDelegateDirty(bool dirty)
 }
 
 QBarSeriesPrivate::QBarSeriesPrivate()
-    : m_barWidth(0.5) // Default value is 50% of category width
-      , m_labelsVisible(false)
-      , m_visible(true)
-      , m_blockBarUpdate(false)
-      , m_labelsFormat()
-      , m_labelsMargin(0)
-      , m_labelsAngle(0)
-      , m_labelsPrecision(6)
-      , m_labelsDirty(true)
-      , m_barDelegateDirty(false)
+    : QAbstractSeriesPrivate(QAbstractSeries::SeriesType::Bar)
+    , m_barWidth(0.5) // Default value is 50% of category width
+    , m_labelsVisible(false)
+    , m_visible(true)
+    , m_blockBarUpdate(false)
+    , m_labelsFormat()
+    , m_labelsMargin(0)
+    , m_labelsAngle(0)
+    , m_labelsPrecision(6)
+    , m_labelsDirty(true)
+    , m_barDelegateDirty(false)
 {
 }
 
diff --git a/src/graphs2d/linechart/qlineseries.cpp b/src/graphs2d/linechart/qlineseries.cpp
index 72f4a806..39bde2b9 100644
--- a/src/graphs2d/linechart/qlineseries.cpp
+++ b/src/graphs2d/linechart/qlineseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/xychart/qxyseries_p.h"
 #include <QtGraphs/qlineseries.h>
 #include <private/qgraphsview_p.h>
 #include <private/qlineseries_p.h>
@@ -110,7 +111,9 @@ QAbstractSeries::SeriesType QLineSeries::type() const
     return QAbstractSeries::SeriesType::Line;
 }
 
-QLineSeriesPrivate::QLineSeriesPrivate() {}
+QLineSeriesPrivate::QLineSeriesPrivate()
+    : QXYSeriesPrivate(QAbstractSeries::SeriesType::Line)
+{}
 
 qreal QLineSeries::width() const
 {
diff --git a/src/graphs2d/piechart/qpieseries.cpp b/src/graphs2d/piechart/qpieseries.cpp
index c3cd2e66..19e388c3 100644
--- a/src/graphs2d/piechart/qpieseries.cpp
+++ b/src/graphs2d/piechart/qpieseries.cpp
@@ -1198,7 +1198,8 @@ void QPieSeries::setAngleSpanLabelVisibility(QPieSeries::LabelVisibility newAngl
 }
 
 QPieSeriesPrivate::QPieSeriesPrivate()
-    : m_pieRelativeHorPos(.5)
+    : QAbstractSeriesPrivate(QAbstractSeries::SeriesType::Pie)
+    , m_pieRelativeHorPos(.5)
     , m_pieRelativeVerPos(.5)
     , m_pieRelativeSize(.7)
     , m_pieStartAngle(0)
diff --git a/src/graphs2d/qabstractseries.cpp b/src/graphs2d/qabstractseries.cpp
index 2c0bc8ee..a919893b 100644
--- a/src/graphs2d/qabstractseries.cpp
+++ b/src/graphs2d/qabstractseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/qabstractseries.h"
 #include <QtGraphs/qabstractseries.h>
 #include <private/qabstractseries_p.h>
 #include <private/qgraphsview_p.h>
@@ -680,7 +681,8 @@ void QAbstractSeries::componentComplete()
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
-QAbstractSeriesPrivate::QAbstractSeriesPrivate()
+QAbstractSeriesPrivate::QAbstractSeriesPrivate(QAbstractSeries::SeriesType type)
+    : m_type(type)
 {
 }
 
diff --git a/src/graphs2d/qabstractseries_p.h b/src/graphs2d/qabstractseries_p.h
index 9907e644..f58c7bd2 100644
--- a/src/graphs2d/qabstractseries_p.h
+++ b/src/graphs2d/qabstractseries_p.h
@@ -14,8 +14,8 @@
 //
 // We mean it.
 
+#include "graphs2d/qabstractseries.h"
 #include <QtGraphs/qabstractseries.h>
-#include <memory>
 #include <private/qobject_p.h>
 #include <QtCore/qloggingcategory.h>
 
@@ -31,11 +31,15 @@ class QAbstractSeriesPrivate : public QObjectPrivate
 {
     Q_DECLARE_PUBLIC(QAbstractSeries)
 public:
-    explicit QAbstractSeriesPrivate();
+    static QAbstractSeriesPrivate *get(QAbstractSeries *item) { return item->d_func(); }
+    static const QAbstractSeriesPrivate *get(const QAbstractSeries *item) { return item->d_func(); }
+
+    explicit QAbstractSeriesPrivate(QAbstractSeries::SeriesType type);
     ~QAbstractSeriesPrivate() override;
 
     void setLegendData(const QList<QLegendData> &legendData);
     void clearLegendData();
+    QAbstractSeries::SeriesType type() { return m_type; }
 
     static void appendSeriesChildren(QQmlListProperty<QObject> *list, QObject *element);
 
@@ -56,6 +60,8 @@ private:
 
     QAbstractAxis *m_axisX = nullptr;
     QAbstractAxis *m_axisY = nullptr;
+
+    QAbstractSeries::SeriesType m_type;
 };
 
 QT_END_NAMESPACE
diff --git a/src/graphs2d/qgraphsview.cpp b/src/graphs2d/qgraphsview.cpp
index 0f5c7701..53def4cd 100644
--- a/src/graphs2d/qgraphsview.cpp
+++ b/src/graphs2d/qgraphsview.cpp
@@ -1,6 +1,8 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/qabstractseries.h"
+#include "graphs2d/qabstractseries_p.h"
 #ifdef USE_AREAGRAPH
 #include <QtGraphs/qareaseries.h>
 #include <private/arearenderer_p.h>
@@ -177,7 +179,7 @@ void QGraphsView::insertSeries(qsizetype index, QObject *object)
 */
 void QGraphsView::removeSeries(QObject *object)
 {
-    if (auto series = reinterpret_cast<QAbstractSeries *>(object)) {
+    if (auto series = qobject_cast<QAbstractSeries *>(object)) {
         series->setGraph(nullptr);
         m_seriesList.removeAll(series);
         auto &cleanupSeriesList = m_cleanupSeriesList[getSeriesRendererIndex(series)];
@@ -1692,7 +1694,7 @@ int QGraphsView::getSeriesRendererIndex(QAbstractSeries *series)
 {
     int index = 0;
     if (series) {
-        switch (series->type()) {
+        switch (QAbstractSeriesPrivate::get(series)->type()) {
         case QAbstractSeries::SeriesType::Bar:
             index = 0;
             break;
diff --git a/src/graphs2d/scatterchart/qscatterseries.cpp b/src/graphs2d/scatterchart/qscatterseries.cpp
index 41d3b1d2..b7ddd000 100644
--- a/src/graphs2d/scatterchart/qscatterseries.cpp
+++ b/src/graphs2d/scatterchart/qscatterseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/xychart/qxyseries_p.h"
 #include <QtGraphs/qscatterseries.h>
 #include <private/qxypoint_p.h>
 #include <private/qscatterseries_p.h>
@@ -140,6 +141,7 @@ QAbstractSeries::SeriesType QScatterSeries::type() const
 }
 
 QScatterSeriesPrivate::QScatterSeriesPrivate()
+ : QXYSeriesPrivate(QAbstractSeries::SeriesType::Scatter)
 {
 }
 
diff --git a/src/graphs2d/splinechart/qsplineseries.cpp b/src/graphs2d/splinechart/qsplineseries.cpp
index 98b6207f..4023e571 100644
--- a/src/graphs2d/splinechart/qsplineseries.cpp
+++ b/src/graphs2d/splinechart/qsplineseries.cpp
@@ -166,7 +166,7 @@ void QSplineSeries::setCapStyle(Qt::PenCapStyle newCapStyle)
 }
 
 QSplineSeriesPrivate::QSplineSeriesPrivate()
-    : QXYSeriesPrivate()
+    : QXYSeriesPrivate(QAbstractSeries::SeriesType::Spline)
     , m_width(1.0)
     , m_capStyle(Qt::PenCapStyle::SquareCap)
     , m_controlPoints()
diff --git a/src/graphs2d/xychart/qxyseries.cpp b/src/graphs2d/xychart/qxyseries.cpp
index 34887ead..a1b1c849 100644
--- a/src/graphs2d/xychart/qxyseries.cpp
+++ b/src/graphs2d/xychart/qxyseries.cpp
@@ -1,6 +1,7 @@
 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
+#include "graphs2d/qabstractseries.h"
 #include <QtGraphs/qxyseries.h>
 #include <private/qxyseries_p.h>
 #include <private/charthelpers_p.h>
@@ -961,7 +962,9 @@ QXYSeries &QXYSeries::operator<< (const QList<QPointF>& points)
     return *this;
 }
 
-QXYSeriesPrivate::QXYSeriesPrivate() {}
+QXYSeriesPrivate::QXYSeriesPrivate(QAbstractSeries::SeriesType type)
+    : QAbstractSeriesPrivate(type)
+{}
 
 void QXYSeriesPrivate::setPointSelected(qsizetype index, bool selected, bool &callSignal)
 {
diff --git a/src/graphs2d/xychart/qxyseries_p.h b/src/graphs2d/xychart/qxyseries_p.h
index 12153f09..77d6ec9f 100644
--- a/src/graphs2d/xychart/qxyseries_p.h
+++ b/src/graphs2d/xychart/qxyseries_p.h
@@ -27,7 +27,7 @@ public:
     static QXYSeriesPrivate *get(QXYSeries *item) { return item->d_func(); }
     static const QXYSeriesPrivate *get(const QXYSeries *item) { return item->d_func(); }
 
-    QXYSeriesPrivate();
+    QXYSeriesPrivate(QAbstractSeries::SeriesType type);
 
     void setPointSelected(qsizetype index, bool selected, bool &callSignal);
     bool isPointSelected(qsizetype index) const;