diff --git a/src/platformsupport/clipboard/qmacmime.mm b/src/platformsupport/clipboard/qmacmime.mm
index c97d961260..2679c92f20 100644
--- a/src/platformsupport/clipboard/qmacmime.mm
+++ b/src/platformsupport/clipboard/qmacmime.mm
@@ -418,10 +418,9 @@ QVariant QMacPasteboardMimeUnicodeText::convertToMime(const QString &mimetype, Q
     QVariant ret;
     if (flavor == QLatin1String("public.utf8-plain-text")) {
         ret = QString::fromUtf8(firstData);
-#if QT_CONFIG(textcodec)
     } else if (flavor == QLatin1String("public.utf16-plain-text")) {
-        ret = QTextCodec::codecForName("UTF-16")->toUnicode(firstData);
-#endif
+        QString str = QStringDecoder(QStringDecoder::Utf16)(firstData);
+        ret = str;
     } else {
         qWarning("QMime::convertToMime: unhandled mimetype: %s", qPrintable(mimetype));
     }
@@ -434,25 +433,23 @@ QList<QByteArray> QMacPasteboardMimeUnicodeText::convertFromMime(const QString &
     QString string = data.toString();
     if (flavor == QLatin1String("public.utf8-plain-text"))
         ret.append(string.toUtf8());
-#if QT_CONFIG(textcodec)
     else if (flavor == QLatin1String("public.utf16-plain-text")) {
-        QTextCodec::ConverterState state;
+        QStringEncoder::Flags f;
 #if defined(Q_OS_MACOS)
         // Some applications such as Microsoft Excel, don't deal well with
         // a BOM present, so we follow the traditional approach of Qt on
         // macOS to not generate public.utf16-plain-text with a BOM.
-        state.flags = QTextCodec::IgnoreHeader;
+        f = QStringEncoder::Flag::Default;
 #else
         // Whereas iOS applications will fail to paste if we do _not_
         // include a BOM in the public.utf16-plain-text content, most
         // likely due to converting the data using NSUTF16StringEncoding
         // which assumes big-endian byte order if there is no BOM.
-        state.flags = QTextCodec::DefaultConversion;
+        f = QStringEncoder::Flag::WriteBom;
 #endif
-        ret.append(QTextCodec::codecForName("UTF-16")->fromUnicode(
-            string.constData(), string.length(), &state));
+        QStringEncoder encoder(QStringEncoder::Utf16, f);
+        ret.append(encoder(string));
     }
-#endif
     return ret;
 }