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diff --git a/src/datavisualization/engine/abstractdeclarativeinterface_p.h b/src/datavisualization/engine/abstractdeclarativeinterface_p.h
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+++ b/src/datavisualization/engine/abstractdeclarativeinterface_p.h
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+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#ifndef ABSTRACTDECLARATIVEINTERFACE_P_H
+#define ABSTRACTDECLARATIVEINTERFACE_P_H
+
+#include <QtDataVisualization/qdatavisualizationglobal.h>
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVisualization API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+QT_BEGIN_NAMESPACE
+
+class Q_DATAVISUALIZATION_EXPORT AbstractDeclarativeInterface
+{
+protected:
+    ~AbstractDeclarativeInterface();
+public:
+    virtual bool isReady() const = 0;
+};
+
+QT_END_NAMESPACE
+
+#endif