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diff --git a/src/serialport/qtntdll_p.h b/src/serialport/qtntdll_p.h
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+++ b/src/serialport/qtntdll_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtSerialPort module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTNTDLL_P_H
+#define QTNTDLL_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt 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.
+//
+
+#include <QtCore/qlibrary.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qdebug.h>
+
+#include <qt_windows.h>
+
+// Internal control codes.
+
+#ifndef CTL_CODE
+#  define CTL_CODE(DeviceType, Function, Method, Access) ( \
+    ((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) \
+    )
+#endif
+
+#ifndef FILE_DEVICE_SERIAL_PORT
+#  define FILE_DEVICE_SERIAL_PORT  27
+#endif
+
+#ifndef METHOD_BUFFERED
+#  define METHOD_BUFFERED  0
+#endif
+
+#ifndef FILE_ANY_ACCESS
+#  define FILE_ANY_ACCESS  0x00000000
+#endif
+
+#ifndef IOCTL_SERIAL_GET_DTRRTS
+#  define IOCTL_SERIAL_GET_DTRRTS \
+    CTL_CODE(FILE_DEVICE_SERIAL_PORT, 30, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#endif
+
+#ifndef SERIAL_DTR_STATE
+#  define SERIAL_DTR_STATE  0x00000001
+#endif
+
+#ifndef SERIAL_RTS_STATE
+#  define SERIAL_RTS_STATE  0x00000002
+#endif
+
+#ifndef IOCTL_SERIAL_WAIT_ON_MASK
+#  define IOCTL_SERIAL_WAIT_ON_MASK \
+    CTL_CODE(FILE_DEVICE_SERIAL_PORT, 18, METHOD_BUFFERED, FILE_ANY_ACCESS)
+#endif
+
+// Internal NT-based data types.
+
+#ifndef NT_SUCCESS
+#define NT_SUCCESS(status) (((NTSTATUS)(status)) >= 0)
+#endif
+
+typedef struct _IO_STATUS_BLOCK {
+    union {
+        NTSTATUS Status;
+        PVOID Pointer;
+    } DUMMYUNIONNAME;
+
+    ULONG_PTR Information;
+} IO_STATUS_BLOCK, *PIO_STATUS_BLOCK;
+
+typedef VOID (WINAPI *PIO_APC_ROUTINE) (
+        PVOID ApcContext,
+        PIO_STATUS_BLOCK IoStatusBlock,
+        ULONG Reserved
+        );
+
+// Resolving macros.
+
+#define GENERATE_SYMBOL_VARIABLE(returnType, symbolName, ...) \
+    typedef returnType (WINAPI *fp_##symbolName)(__VA_ARGS__); \
+    static fp_##symbolName symbolName;
+
+#define RESOLVE_SYMBOL(symbolName) \
+    symbolName = reinterpret_cast<fp_##symbolName>(resolveSymbol(ntLibrary, #symbolName)); \
+    if (!symbolName) \
+        return false;
+
+GENERATE_SYMBOL_VARIABLE(ULONG, RtlNtStatusToDosError, NTSTATUS)
+GENERATE_SYMBOL_VARIABLE(NTSTATUS, NtDeviceIoControlFile, HANDLE, HANDLE, PIO_APC_ROUTINE, PVOID, PIO_STATUS_BLOCK, ULONG, PVOID, ULONG, PVOID, ULONG)
+
+inline QFunctionPointer resolveSymbol(QLibrary *ntLibrary, const char *symbolName)
+{
+    QFunctionPointer symbolFunctionPointer = ntLibrary->resolve(symbolName);
+    if (!symbolFunctionPointer)
+        qWarning("Failed to resolve the symbol: %s", symbolName);
+
+    return symbolFunctionPointer;
+}
+
+inline bool resolveSymbols(QLibrary *ntLibrary)
+{
+    if (!ntLibrary->isLoaded()) {
+        ntLibrary->setFileName(QStringLiteral("ntdll"));
+        if (!ntLibrary->load()) {
+            qWarning("Failed to load the library: %s", qPrintable(ntLibrary->fileName()));
+            return false;
+        }
+    }
+
+    RESOLVE_SYMBOL(RtlNtStatusToDosError)
+    RESOLVE_SYMBOL(NtDeviceIoControlFile)
+
+    return true;
+}
+
+#endif // QTNTDLL_P_H