diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index f1f38c95ff0..83de88bd7ec 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -212,7 +212,7 @@ qt_internal_add_module(Core
         serialization/qtextstream.cpp serialization/qtextstream.h serialization/qtextstream_p.h
         serialization/qxmlutils.cpp serialization/qxmlutils_p.h
         text/qanystringview.cpp text/qanystringview.h
-        text/qbytearray.cpp text/qbytearray.h text/qbytearray_p.h
+        text/qbytearray.cpp text/qbytearray.h
         text/qbytearrayalgorithms.h
         text/qbytearraylist.cpp text/qbytearraylist.h
         text/qbytearraymatcher.cpp text/qbytearraymatcher.h
diff --git a/src/corelib/text/qbytearray_p.h b/src/corelib/text/qbytearray_p.h
deleted file mode 100644
index 7103a0428af..00000000000
--- a/src/corelib/text/qbytearray_p.h
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-
-#ifndef QBYTEARRAY_P_H
-#define QBYTEARRAY_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists for the convenience
-// of other Qt classes.  This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include <QtCore/qbytearray.h>
-
-QT_BEGIN_NAMESPACE
-
-// -1 because of the terminating NUL
-constexpr qsizetype MaxByteArraySize = QtPrivate::MaxAllocSize - sizeof(std::remove_pointer<QByteArray::DataPointer>::type) - 1;
-constexpr qsizetype MaxStringSize = (QtPrivate::MaxAllocSize - sizeof(std::remove_pointer<QByteArray::DataPointer>::type)) / 2 - 1;
-
-QT_END_NAMESPACE
-
-#endif // QBYTEARRAY_P_H