diff --git a/src/corelib/io/qfile.h b/src/corelib/io/qfile.h
index f608ca48f5..cb06665a9f 100644
--- a/src/corelib/io/qfile.h
+++ b/src/corelib/io/qfile.h
@@ -27,6 +27,12 @@ namespace std {
 QT_BEGIN_NAMESPACE
 
 #ifdef Q_OS_WIN
+
+#if QT_DEPRECATED_SINCE(6,6)
+QT_DEPRECATED_VERSION_X_6_6("Use QNtfsPermissionCheckGuard RAII class instead.")
+Q_CORE_EXPORT extern int qt_ntfs_permission_lookup;      // defined in qfilesystemengine_win.cpp
+#endif
+
 Q_CORE_EXPORT bool qEnableNtfsPermissionChecks() noexcept;
 Q_CORE_EXPORT bool qDisableNtfsPermissionChecks() noexcept;
 Q_CORE_EXPORT bool qAreNtfsPermissionChecksEnabled() noexcept;
diff --git a/src/corelib/io/qfilesystemengine_win.cpp b/src/corelib/io/qfilesystemengine_win.cpp
index fbc55954cb..49f375c4bb 100644
--- a/src/corelib/io/qfilesystemengine_win.cpp
+++ b/src/corelib/io/qfilesystemengine_win.cpp
@@ -381,11 +381,15 @@ constexpr QFileDevice::Permissions toSpecificPermissions(PermissionTag tag,
 } // anonymous namespace
 #endif // QT_CONFIG(fslibs)
 
-
-Q_CORE_EXPORT int qt_ntfs_permission_lookup = 0;
+#if QT_DEPRECATED_SINCE(6,6)
+int qt_ntfs_permission_lookup = 0;
+#endif
 
 static QBasicAtomicInt qt_ntfs_permission_lookup_v2 = Q_BASIC_ATOMIC_INITIALIZER(0);
 
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+
 /*!
     \internal
 
@@ -395,7 +399,7 @@ static QBasicAtomicInt qt_ntfs_permission_lookup_v2 = Q_BASIC_ATOMIC_INITIALIZER
 bool qEnableNtfsPermissionChecks() noexcept
 {
     return qt_ntfs_permission_lookup_v2.fetchAndAddRelaxed(1)
-        + qt_ntfs_permission_lookup
+QT_IF_DEPRECATED_SINCE(6, 6, /*nothing*/, + qt_ntfs_permission_lookup)
         != 0;
 }
 
@@ -408,7 +412,7 @@ bool qEnableNtfsPermissionChecks() noexcept
 bool qDisableNtfsPermissionChecks() noexcept
 {
     return qt_ntfs_permission_lookup_v2.fetchAndSubRelaxed(1)
-        + qt_ntfs_permission_lookup
+QT_IF_DEPRECATED_SINCE(6, 6, /*nothing*/, + qt_ntfs_permission_lookup)
         == 1;
 }
 
@@ -421,8 +425,10 @@ bool qDisableNtfsPermissionChecks() noexcept
 bool qAreNtfsPermissionChecksEnabled() noexcept
 {
     return qt_ntfs_permission_lookup_v2.loadRelaxed()
-        + qt_ntfs_permission_lookup;
+QT_IF_DEPRECATED_SINCE(6, 6, /*nothing*/, + qt_ntfs_permission_lookup)
+        ;
 }
+QT_WARNING_POP
 
 /*!
     \class QNativeFilePermissions
diff --git a/tests/auto/corelib/io/qfile/tst_qfile.cpp b/tests/auto/corelib/io/qfile/tst_qfile.cpp
index c8048c21c8..a7b3464fd6 100644
--- a/tests/auto/corelib/io/qfile/tst_qfile.cpp
+++ b/tests/auto/corelib/io/qfile/tst_qfile.cpp
@@ -171,7 +171,9 @@ private slots:
 #ifdef Q_OS_WIN
     void permissionsNtfs_data();
     void permissionsNtfs();
+#if QT_DEPRECATED_SINCE(6,6)
     void deprecatedNtfsPermissionCheck();
+#endif
 #endif
     void setPermissions_data();
     void setPermissions();
@@ -1418,6 +1420,9 @@ void tst_QFile::permissionsNtfs()
     permissions();
 }
 
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
+#if QT_DEPRECATED_SINCE(6,6)
 void tst_QFile::deprecatedNtfsPermissionCheck()
 {
     QScopedValueRollback<int> guard(qt_ntfs_permission_lookup);
@@ -1428,6 +1433,8 @@ void tst_QFile::deprecatedNtfsPermissionCheck()
     qt_ntfs_permission_lookup--;
     QCOMPARE(qAreNtfsPermissionChecksEnabled(), false);
 }
+#endif
+QT_WARNING_POP
 
 #endif