diff --git a/src/corelib/kernel/qmetaobjectbuilder.cpp b/src/corelib/kernel/qmetaobjectbuilder.cpp
index e511f14686c..e98e113413a 100644
--- a/src/corelib/kernel/qmetaobjectbuilder.cpp
+++ b/src/corelib/kernel/qmetaobjectbuilder.cpp
@@ -153,17 +153,24 @@ class QMetaEnumBuilderPrivate
 {
 public:
     QMetaEnumBuilderPrivate(const QByteArray &_name)
-        : name(_name), enumName(_name), isFlag(false), isScoped(false)
+        : name(_name), enumName(_name)
     {
     }
 
     QByteArray name;
     QByteArray enumName;
     QMetaType metaType;
-    bool isFlag;
-    bool isScoped;
     QList<QByteArray> keys;
-    QList<int> values;
+    QList<quint64> values;
+    QFlags<EnumFlags> flags = {};
+
+    int addKey(const QByteArray &name, quint64 value)
+    {
+        int index = keys.size();
+        keys += name;
+        values += value;
+        return index;
+    }
 };
 Q_DECLARE_TYPEINFO(QMetaEnumBuilderPrivate, Q_RELOCATABLE_TYPE);
 
@@ -592,7 +599,9 @@ QMetaEnumBuilder QMetaObjectBuilder::addEnumerator(const QMetaEnum &prototype)
     en.setIsScoped(prototype.isScoped());
     int count = prototype.keyCount();
     for (int index = 0; index < count; ++index)
-        en.addKey(prototype.key(index), prototype.value(index));
+        en.addKey(prototype.key(index), prototype.value64(index).value_or(0));
+    // reset the is64Bit() flag if necessary
+    en.setIs64Bit(prototype.is64Bit());
     return en;
 }
 
@@ -1206,8 +1215,11 @@ static int buildMetaObject(QMetaObjectBuilderPrivate *d, char *buf,
 
     // Allocate space for the enumerator key names and values.
     enumIndex = dataIndex;
-    for (const auto &enumerator : d->enumerators)
+    for (const auto &enumerator : d->enumerators) {
         dataIndex += 2 * enumerator.keys.size();
+        if (enumerator.flags & EnumIs64Bit)
+            dataIndex += enumerator.keys.size();
+    }
 
     // Zero terminator at the end of the data offset table.
     ++dataIndex;
@@ -1334,26 +1346,30 @@ static int buildMetaObject(QMetaObjectBuilderPrivate *d, char *buf,
     for (const auto &enumerator : d->enumerators) {
         [[maybe_unused]] int name = strings.enter(enumerator.name);
         [[maybe_unused]] int enumName = strings.enter(enumerator.enumName);
-        [[maybe_unused]] int isFlag = enumerator.isFlag ? EnumIsFlag : EnumFlags{};
-        [[maybe_unused]] int isScoped = enumerator.isScoped ? EnumIsScoped : EnumFlags{};
         int count = enumerator.keys.size();
-        int enumOffset = enumIndex;
         if constexpr (mode == Construct) {
             data[dataIndex]     = name;
             data[dataIndex + 1] = enumName;
-            data[dataIndex + 2] = isFlag | isScoped;
+            data[dataIndex + 2] = enumerator.flags.toInt();
             data[dataIndex + 3] = count;
-            data[dataIndex + 4] = enumOffset;
+            data[dataIndex + 4] = enumIndex;
         }
         for (int key = 0; key < count; ++key) {
             [[maybe_unused]] int keyIndex = strings.enter(enumerator.keys[key]);
             if constexpr (mode == Construct) {
-                data[enumOffset++] = keyIndex;
-                data[enumOffset++] = enumerator.values[key];
+                data[enumIndex + 0] = keyIndex;
+                data[enumIndex + 1] = uint(enumerator.values[key]);
             }
+            enumIndex += 2;
+        }
+        bool is64Bit = enumerator.flags.testAnyFlags(EnumIs64Bit);
+        for (int key = 0; is64Bit && key < count; ++key) {
+            if constexpr (mode == Construct) {
+                data[enumIndex] = uint(enumerator.values[key] >> 32);
+            }
+            ++enumIndex;
         }
         dataIndex += QMetaObjectPrivate::IntsPerEnum;
-        enumIndex += 2 * count;
     }
 
     // Output the constructors in the class.
@@ -2312,7 +2328,8 @@ QMetaType QMetaEnumBuilder::metaType() const
 }
 
 /*!
-    Sets this enumerator to have the given \c metaType.
+    Sets this enumerator to have the given \c metaType. The is64Bit() flag will
+    be set to match \a metaType's size.
 
     \since 6.6
     \sa metaType()
@@ -2320,8 +2337,10 @@ QMetaType QMetaEnumBuilder::metaType() const
 void QMetaEnumBuilder::setMetaType(QMetaType metaType)
 {
     QMetaEnumBuilderPrivate *d = d_func();
-    if (d)
+    if (d) {
         d->metaType = metaType;
+        setIs64Bit(metaType.sizeOf() > 4);
+    }
 }
 
 /*!
@@ -2334,7 +2353,7 @@ bool QMetaEnumBuilder::isFlag() const
 {
     QMetaEnumBuilderPrivate *d = d_func();
     if (d)
-        return d->isFlag;
+        return d->flags.toInt() & EnumIsFlag;
     else
         return false;
 }
@@ -2348,7 +2367,7 @@ void QMetaEnumBuilder::setIsFlag(bool value)
 {
     QMetaEnumBuilderPrivate *d = d_func();
     if (d)
-        d->isFlag = value;
+        d->flags.setFlag(EnumIsFlag, value);
 }
 
 /*!
@@ -2360,7 +2379,7 @@ bool QMetaEnumBuilder::isScoped() const
 {
     QMetaEnumBuilderPrivate *d = d_func();
     if (d)
-        return d->isScoped;
+        return d->flags.toInt() & EnumIsScoped;
     return false;
 }
 
@@ -2373,7 +2392,37 @@ void QMetaEnumBuilder::setIsScoped(bool value)
 {
     QMetaEnumBuilderPrivate *d = d_func();
     if (d)
-        d->isScoped = value;
+        d->flags.setFlag(EnumIsScoped, value);
+}
+
+/*!
+    Return \c true if this enumerations in this enumerator are 64-bit.
+
+    This flag is autoamtically enabled if a 64-bit value is added with addKey().
+
+    \sa setIs64Bit()
+*/
+bool QMetaEnumBuilder::is64Bit() const
+{
+    QMetaEnumBuilderPrivate *d = d_func();
+    if (d)
+        return d->flags.toInt() & EnumIs64Bit;
+    return false;
+}
+
+/*!
+    Sets this enumerator to be 64-bit wide if \a value is true. If \a value is
+    false, any stored 64-bit keys will be truncated to 32 bits.
+
+    This flag is autoamtically enabled if a 64-bit value is added with addKey().
+
+    \sa is64Bit()
+*/
+void QMetaEnumBuilder::setIs64Bit(bool value)
+{
+    QMetaEnumBuilderPrivate *d = d_func();
+    if (d)
+        d->flags.setFlag(EnumIs64Bit, value);
 }
 
 /*!
@@ -2409,15 +2458,38 @@ QByteArray QMetaEnumBuilder::key(int index) const
     Returns the value with the given \a index; or returns -1 if there
     is no such value.
 
-    \sa keyCount(), addKey(), key()
+    If this is a 64-bit enumeration (see is64Bit()), this function returns the
+    low 32-bit portion of the value. Use value64() to obtain the full value
+    instead.
+
+    \sa value64(), keyCount(), addKey(), key(), is64Bit()
 */
 int QMetaEnumBuilder::value(int index) const
+{
+    return value64(index).value_or(-1);
+}
+
+/*!
+    \since 6.9
+
+    Returns the value with the given \a index if it exists; or returns a
+    disengaged \c{std::optional} if it doesn't.
+
+    \include qmetaobject.cpp qmetaenum-32bit-zeroextend-64bit
+
+    \sa keyCount(), key(), addKey()
+*/
+std::optional<quint64> QMetaEnumBuilder::value64(int index) const
 {
     QMetaEnumBuilderPrivate *d = d_func();
-    if (d && index >= 0 && index < d->keys.size())
-        return d->values[index];
-    else
-        return -1;
+    if (d && index >= 0 && index < d->keys.size()) {
+        quint64 v = d->values[index];
+        if (d->flags & EnumIs64Bit)
+            return v;
+        return uint(v);     // return only the low 32 bits
+    } else {
+        return std::nullopt;
+    }
 }
 
 /*!
@@ -2430,15 +2502,33 @@ int QMetaEnumBuilder::addKey(const QByteArray &name, int value)
 {
     QMetaEnumBuilderPrivate *d = d_func();
     if (d) {
-        int index = d->keys.size();
-        d->keys += name;
-        d->values += value;
-        return index;
+        return d->addKey(name, uint(value));
     } else {
         return -1;
     }
 }
 
+/*!
+    \since 6.9
+
+    Adds a new key called \a name to this enumerator, associated
+    with \a value.  Returns the index of the new key.
+
+    Using the 64-bit version of this function automatically makes this
+    enumeration be stored as 64-bit.
+
+    \sa keyCount(), key(), value(), removeKey(), is64Bit()
+*/
+int QMetaEnumBuilder::addKey(const QByteArray &name, quint64 value)
+{
+    QMetaEnumBuilderPrivate *d = d_func();
+    if (d) {
+        setIs64Bit(true);
+        return d->addKey(name, value);
+    }
+    return -1;
+}
+
 /*!
     Removes the key at \a index from this enumerator.
 
diff --git a/src/corelib/kernel/qmetaobjectbuilder_p.h b/src/corelib/kernel/qmetaobjectbuilder_p.h
index b52487986ce..697398aa2b3 100644
--- a/src/corelib/kernel/qmetaobjectbuilder_p.h
+++ b/src/corelib/kernel/qmetaobjectbuilder_p.h
@@ -267,11 +267,16 @@ public:
     bool isScoped() const;
     void setIsScoped(bool value);
 
+    bool is64Bit() const;
+    void setIs64Bit(bool value);
+
     int keyCount() const;
     QByteArray key(int index) const;
     int value(int index) const;
+    std::optional<quint64> value64(int index) const;
 
-    int addKey(const QByteArray& name, int value);
+    int addKey(const QByteArray &name, int value);
+    int addKey(const QByteArray &name, quint64 value);
     void removeKey(int index);
 
 private:
diff --git a/tests/auto/corelib/kernel/qmetaobjectbuilder/tst_qmetaobjectbuilder.cpp b/tests/auto/corelib/kernel/qmetaobjectbuilder/tst_qmetaobjectbuilder.cpp
index 18e4e2a4a90..fa927536b77 100644
--- a/tests/auto/corelib/kernel/qmetaobjectbuilder/tst_qmetaobjectbuilder.cpp
+++ b/tests/auto/corelib/kernel/qmetaobjectbuilder/tst_qmetaobjectbuilder.cpp
@@ -75,6 +75,8 @@ class SomethingOfEverything : public QObject
     Q_PROPERTY(QLocale::Language language READ language)
     Q_ENUMS(SomethingEnum)
     Q_FLAGS(SomethingFlag)
+    Q_ENUMS(SomethingEnum64)
+    Q_FLAGS(SomethingFlag64)
 public:
     Q_INVOKABLE SomethingOfEverything() {}
     ~SomethingOfEverything() {}
@@ -85,6 +87,12 @@ public:
         JKL = 10
     };
 
+    enum SomethingEnum64 : qint64
+    {
+        MNO = -1,
+        PQR = 0x1'2345'5678,
+    };
+
     enum SomethingFlagEnum
     {
         XYZ = 1,
@@ -92,6 +100,13 @@ public:
     };
     Q_DECLARE_FLAGS(SomethingFlag, SomethingFlagEnum)
 
+    enum SomethingFlagEnum64 : quint64
+    {
+        RST = Q_UINT64_C(1) << 31,
+        OPQ = Q_UINT64_C(1) << 63,
+    };
+    Q_DECLARE_FLAGS(SomethingFlag64, SomethingFlagEnum64)
+
     Q_INVOKABLE Q_SCRIPTABLE void method1() {}
 
     QString prop() const { return QString(); }
@@ -806,6 +821,7 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum1.name(), QByteArray("foo"));
     QVERIFY(!enum1.isFlag());
     QVERIFY(!enum1.isScoped());
+    QVERIFY(!enum1.is64Bit());
     QCOMPARE(enum1.keyCount(), 0);
     QCOMPARE(enum1.index(), 0);
     QCOMPARE(builder.enumeratorCount(), 1);
@@ -815,6 +831,7 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum2.name(), QByteArray("bar"));
     QVERIFY(!enum2.isFlag());
     QVERIFY(!enum2.isScoped());
+    QVERIFY(!enum2.is64Bit());
     QCOMPARE(enum2.keyCount(), 0);
     QCOMPARE(enum2.index(), 1);
     QCOMPARE(builder.enumeratorCount(), 2);
@@ -831,9 +848,12 @@ void tst_QMetaObjectBuilder::enumerator()
     enum1.setIsScoped(true);
     enum1.setEnumName(QByteArrayLiteral("fooFlag"));
     enum1.setMetaType(QMetaType(&fooFlagMetaType));
+    QVERIFY(enum1.is64Bit());
+    enum1.setIs64Bit(false);
+    QVERIFY(!enum1.is64Bit());
     QCOMPARE(enum1.addKey("ABC", 0), 0);
     QCOMPARE(enum1.addKey("DEF", 1), 1);
-    QCOMPARE(enum1.addKey("GHI", -1), 2);
+    QCOMPARE(enum1.addKey("GHI", -2), 2);
 
     // Check that enum1 is changed, but enum2 is not.
     QCOMPARE(enum1.name(), QByteArray("foo"));
@@ -849,7 +869,10 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum1.key(3), QByteArray());
     QCOMPARE(enum1.value(0), 0);
     QCOMPARE(enum1.value(1), 1);
-    QCOMPARE(enum1.value(2), -1);
+    QCOMPARE(enum1.value(2), -2);
+    QCOMPARE(enum1.value64(0), 0);
+    QCOMPARE(enum1.value64(1), 1);
+    QCOMPARE(enum1.value64(2), uint(-2));
     QCOMPARE(enum2.name(), QByteArray("bar"));
     QVERIFY(!enum2.isFlag());
     QVERIFY(!enum2.isScoped());
@@ -859,12 +882,14 @@ void tst_QMetaObjectBuilder::enumerator()
     // Modify the attributes on enum2.
     enum2.setIsFlag(true);
     QCOMPARE(enum2.addKey("XYZ", 10), 0);
-    QCOMPARE(enum2.addKey("UVW", 19), 1);
+    QCOMPARE(enum2.addKey("UVW", quint64(1) << 32), 1);
+    QVERIFY(enum2.is64Bit());
 
     // This time check that only method2 changed.
     QCOMPARE(enum1.name(), QByteArray("foo"));
     QVERIFY(enum1.isFlag());
     QVERIFY(enum1.isScoped());
+    QVERIFY(!enum1.is64Bit());
     QCOMPARE(enum1.keyCount(), 3);
     QCOMPARE(enum1.index(), 0);
     QCOMPARE(enum1.key(0), QByteArray("ABC"));
@@ -873,17 +898,35 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum1.key(3), QByteArray());
     QCOMPARE(enum1.value(0), 0);
     QCOMPARE(enum1.value(1), 1);
-    QCOMPARE(enum1.value(2), -1);
+    QCOMPARE(enum1.value(2), -2);
+    QCOMPARE(enum1.value64(0), 0);
+    QCOMPARE(enum1.value64(1), 1);
+    QCOMPARE(enum1.value64(2), uint(-2));
     QCOMPARE(enum2.name(), QByteArray("bar"));
     QVERIFY(enum2.isFlag());
     QVERIFY(!enum2.isScoped());
+    QVERIFY(enum2.is64Bit());
     QCOMPARE(enum2.keyCount(), 2);
     QCOMPARE(enum2.index(), 1);
     QCOMPARE(enum2.key(0), QByteArray("XYZ"));
     QCOMPARE(enum2.key(1), QByteArray("UVW"));
     QCOMPARE(enum2.key(2), QByteArray());
     QCOMPARE(enum2.value(0), 10);
-    QCOMPARE(enum2.value(1), 19);
+    QCOMPARE(enum2.value(1), 0);    // truncated!
+    QCOMPARE(enum2.value64(0), 10);
+    QCOMPARE(enum2.value64(1), quint64(1) << 32);
+
+    // Reset enum2 to 32 bits
+    enum2.setIs64Bit(false);
+    QCOMPARE(enum2.value(0), 10);
+    QCOMPARE(enum2.value(1), 0);
+    QCOMPARE(enum2.value64(0), 10);
+    QCOMPARE(enum2.value64(1), 0);
+
+    // Reset back restores it
+    enum2.setIs64Bit(true);
+    QCOMPARE(enum2.value64(0), 10);
+    QCOMPARE(enum2.value64(1), quint64(1) << 32);
 
     // Remove enum1 key
     enum1.removeKey(2);
@@ -898,6 +941,9 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum1.value(0), 0);
     QCOMPARE(enum1.value(1), 1);
     QCOMPARE(enum1.value(2), -1);
+    QCOMPARE(enum1.value64(0), 0);
+    QCOMPARE(enum1.value64(1), 1);
+    QCOMPARE(enum1.value64(2), std::nullopt);
     QCOMPARE(enum2.name(), QByteArray("bar"));
     QVERIFY(enum2.isFlag());
     QVERIFY(!enum2.isScoped());
@@ -907,7 +953,9 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum2.key(1), QByteArray("UVW"));
     QCOMPARE(enum2.key(2), QByteArray());
     QCOMPARE(enum2.value(0), 10);
-    QCOMPARE(enum2.value(1), 19);
+    QCOMPARE(enum2.value(1), 0);        // truncated!
+    QCOMPARE(enum2.value64(0), 10);
+    QCOMPARE(enum2.value64(1), quint64(1) << 32);
 
     // Remove enum1 and check that enum2 becomes index 0.
     builder.removeEnumerator(0);
@@ -922,7 +970,9 @@ void tst_QMetaObjectBuilder::enumerator()
     QCOMPARE(enum2.key(1), QByteArray("UVW"));
     QCOMPARE(enum2.key(2), QByteArray());
     QCOMPARE(enum2.value(0), 10);
-    QCOMPARE(enum2.value(1), 19);
+    QCOMPARE(enum2.value(1), 0);        // truncated!
+    QCOMPARE(enum2.value64(0), 10);
+    QCOMPARE(enum2.value64(1), quint64(1) << 32);
 
     // Perform index-based lookup again.
     QCOMPARE(builder.indexOfEnumerator("foo"), -1);
@@ -1185,13 +1235,19 @@ static bool sameEnumerator(const QMetaEnum& enum1, const QMetaEnum& enum2)
     for (int index = 0; index < enum1.keyCount(); ++index) {
         if (QByteArray(enum1.key(index)) != QByteArray(enum2.key(index)))
             return false;
-        if (enum1.value(index) != enum2.value(index))
+        if (enum1.value64(index) != enum2.value64(index))
             return false;
     }
 
     if (QByteArray(enum1.scope()) != QByteArray(enum2.scope()))
         return false;
 
+    if (enum1.isScoped() != enum2.isScoped())
+        return false;
+
+    if (enum1.is64Bit() != enum2.is64Bit())
+        return false;
+
     return true;
 }