diff --git a/src/corelib/CMakeLists.txt b/src/corelib/CMakeLists.txt
index 7385b0f27e6..cb466d389b8 100644
--- a/src/corelib/CMakeLists.txt
+++ b/src/corelib/CMakeLists.txt
@@ -157,7 +157,6 @@ qt_internal_add_module(Core
         kernel/qchronotimer.cpp kernel/qchronotimer.h
         kernel/qcoreapplication.cpp kernel/qcoreapplication.h kernel/qcoreapplication_p.h
         kernel/qcoreapplication_platform.h
-        kernel/qcorecmdlineargs_p.h
         kernel/qcoreevent.cpp kernel/qcoreevent.h kernel/qcoreevent_p.h
         kernel/qdeadlinetimer.cpp kernel/qdeadlinetimer.h
         kernel/qelapsedtimer.cpp kernel/qelapsedtimer.h
diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index e804e738854..cdc4b47db90 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -13,7 +13,6 @@
 #endif
 #include "qmetaobject.h"
 #include <private/qproperty_p.h>
-#include "qcorecmdlineargs_p.h"
 #include <qdatastream.h>
 #include <qdebug.h>
 #include <qdir.h>
@@ -110,6 +109,10 @@
 #include <memory>
 #include <string>
 
+#ifdef Q_OS_WIN
+#  include <qt_windows.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
 #ifndef QT_NO_QOBJECT
@@ -2536,6 +2539,22 @@ qint64 QCoreApplication::applicationPid()
 #endif
 }
 
+#ifdef Q_OS_WIN
+static inline QStringList winCmdArgs(const QString &cmdLine)
+{
+    QStringList result;
+    int size;
+    if (wchar_t **argv = CommandLineToArgvW(reinterpret_cast<const wchar_t *>(cmdLine.utf16()), &size)) {
+        result.reserve(size);
+        wchar_t **argvEnd = argv + size;
+        for (wchar_t **a = argv; a < argvEnd; ++a)
+            result.append(QString::fromWCharArray(*a));
+        LocalFree(argv);
+    }
+    return result;
+}
+#endif // Q_OS_WIN
+
 /*!
     \since 4.1
 
@@ -2591,7 +2610,7 @@ QStringList QCoreApplication::arguments()
         // the Windows API instead of using argv. Note that we only
         // do this when argv were not modified by the user in main().
         QString cmdline = QString::fromWCharArray(GetCommandLine());
-        QStringList commandLineArguments = qWinCmdArgs(cmdline);
+        QStringList commandLineArguments = winCmdArgs(cmdline);
 
         // Even if the user didn't modify argv before passing them
         // on to QCoreApplication, derived QApplications might have.
diff --git a/src/corelib/kernel/qcorecmdlineargs_p.h b/src/corelib/kernel/qcorecmdlineargs_p.h
deleted file mode 100644
index 2b8d9763f61..00000000000
--- a/src/corelib/kernel/qcorecmdlineargs_p.h
+++ /dev/null
@@ -1,54 +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 QCORECMDLINEARGS_P_H
-#define QCORECMDLINEARGS_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/private/qglobal_p.h>
-#include "QtCore/qstring.h"
-#include "QtCore/qstringlist.h"
-
-#if defined(Q_OS_WIN)
-#  ifdef Q_OS_WIN32
-#    include <qt_windows.h> // first to suppress min, max macros.
-#    include <shlobj.h>
-#  else
-#    include <qt_windows.h>
-#  endif
-
-QT_BEGIN_NAMESPACE
-
-#if defined(Q_OS_WIN32)
-
-static inline QStringList qWinCmdArgs(const QString &cmdLine)
-{
-    QStringList result;
-    int size;
-    if (wchar_t **argv = CommandLineToArgvW((const wchar_t *)cmdLine.utf16(), &size)) {
-        result.reserve(size);
-        wchar_t **argvEnd = argv + size;
-        for (wchar_t **a = argv; a < argvEnd; ++a)
-            result.append(QString::fromWCharArray(*a));
-        LocalFree(argv);
-    }
-    return result;
-}
-
-#endif // Q_OS_WIN32
-
-QT_END_NAMESPACE
-
-#endif // Q_OS_WIN
-
-#endif // QCORECMDLINEARGS_WIN_P_H