diff --git a/src/gui/text/qfont.cpp b/src/gui/text/qfont.cpp
index ba36b0790d..ae0c495dcf 100644
--- a/src/gui/text/qfont.cpp
+++ b/src/gui/text/qfont.cpp
@@ -2387,8 +2387,12 @@ QDataStream &operator<<(QDataStream &s, const QFont &font)
         s << (quint8)font.d->request.hintingPreference;
     if (s.version() >= QDataStream::Qt_5_6)
         s << (quint8)font.d->capital;
-    if (s.version() >= QDataStream::Qt_5_13)
-        s << font.d->request.families;
+    if (s.version() >= QDataStream::Qt_5_13) {
+        if (s.version() < QDataStream::Qt_6_0)
+            s << font.d->request.families.mid(1);
+        else
+            s << font.d->request.families;
+    }
     return s;
 }
 
@@ -2498,7 +2502,10 @@ QDataStream &operator>>(QDataStream &s, QFont &font)
     if (s.version() >= QDataStream::Qt_5_13) {
         QStringList value;
         s >> value;
-        font.d->request.families = value;
+        if (s.version() < QDataStream::Qt_6_0)
+            font.d->request.families.append(value);
+        else
+            font.d->request.families = value;
     }
     return s;
 }
diff --git a/tests/auto/gui/text/qfont/CMakeLists.txt b/tests/auto/gui/text/qfont/CMakeLists.txt
index 05c6ca8270..6e0583bc30 100644
--- a/tests/auto/gui/text/qfont/CMakeLists.txt
+++ b/tests/auto/gui/text/qfont/CMakeLists.txt
@@ -16,6 +16,7 @@ qt_internal_add_test(tst_qfont
 
 # Resources:
 set(testfont_resource_files
+    "datastream.515"
     "weirdfont.otf"
 )
 
diff --git a/tests/auto/gui/text/qfont/datastream.515 b/tests/auto/gui/text/qfont/datastream.515
new file mode 100644
index 0000000000..acd99e7e9b
Binary files /dev/null and b/tests/auto/gui/text/qfont/datastream.515 differ
diff --git a/tests/auto/gui/text/qfont/testfont.qrc b/tests/auto/gui/text/qfont/testfont.qrc
index cf51e4a2b4..7a7b66f984 100644
--- a/tests/auto/gui/text/qfont/testfont.qrc
+++ b/tests/auto/gui/text/qfont/testfont.qrc
@@ -1,5 +1,6 @@
 <RCC>
     <qresource prefix="/">
         <file>weirdfont.otf</file>
+        <file>datastream.515</file>
     </qresource>
 </RCC>
diff --git a/tests/auto/gui/text/qfont/tst_qfont.cpp b/tests/auto/gui/text/qfont/tst_qfont.cpp
index 6bae45e5c3..e0ece40bdf 100644
--- a/tests/auto/gui/text/qfont/tst_qfont.cpp
+++ b/tests/auto/gui/text/qfont/tst_qfont.cpp
@@ -62,6 +62,7 @@ private slots:
     void insertAndRemoveSubstitutions();
     void serialize_data();
     void serialize();
+    void deserializeQt515();
 
     void styleName();
     void defaultFamily_data();
@@ -511,6 +512,43 @@ void tst_QFont::serialize()
     }
 }
 
+void tst_QFont::deserializeQt515()
+{
+    QFile file;
+    file.setFileName(QFINDTESTDATA("datastream.515"));
+    QVERIFY(file.open(QIODevice::ReadOnly));
+
+    QFont font;
+    {
+        QDataStream stream(&file);
+        stream.setVersion(QDataStream::Qt_5_15);
+        stream >> font;
+    }
+
+    QCOMPARE(font.family(), QStringLiteral("FirstFamily"));
+    QCOMPARE(font.families().size(), 3);
+    QCOMPARE(font.families().at(0), QStringLiteral("FirstFamily"));
+    QCOMPARE(font.families().at(1), QStringLiteral("OtherFamily1"));
+    QCOMPARE(font.families().at(2), QStringLiteral("OtherFamily2"));
+    QCOMPARE(font.pointSize(), 12);
+
+    QVERIFY(file.reset());
+    QByteArray fileContent = file.readAll();
+    QByteArray serializedContent;
+    {
+        QBuffer buffer(&serializedContent);
+        QVERIFY(buffer.open(QIODevice::WriteOnly));
+
+        QDataStream stream(&buffer);
+        stream.setVersion(QDataStream::Qt_5_15);
+        stream << font;
+    }
+
+    QCOMPARE(serializedContent, fileContent);
+
+    file.close();
+}
+
 void tst_QFont::styleName()
 {
 #if !defined(Q_OS_MAC)