diff --git a/src/corelib/global/qcompare.h b/src/corelib/global/qcompare.h
index 38839e36921..a807e6001c8 100644
--- a/src/corelib/global/qcompare.h
+++ b/src/corelib/global/qcompare.h
@@ -21,12 +21,6 @@
 
 QT_BEGIN_NAMESPACE
 
-#if defined(Q_CC_MSVC)
-#define Q_COMPARE_CAST_IMPLICIT explicit
-#else
-#define Q_COMPARE_CAST_IMPLICIT Q_IMPLICIT
-#endif // Q_CC_MSVC
-
 namespace QtPrivate {
 using CompareUnderlyingType = qint8;
 
@@ -376,23 +370,6 @@ public:
 #endif // __cpp_lib_bit_cast
     }
 
-    constexpr Q_COMPARE_CAST_IMPLICIT operator std::partial_ordering() const noexcept
-    {
-        static_assert(sizeof(*this) == sizeof(std::partial_ordering));
-#ifdef __cpp_lib_bit_cast
-        return std::bit_cast<std::partial_ordering>(*this);
-#else
-        using O = QtPrivate::Ordering;
-        using R = std::partial_ordering;
-        switch (m_order) {
-        case qToUnderlying(O::Less):       return R::less;
-        case qToUnderlying(O::Greater):    return R::greater;
-        case qToUnderlying(O::Equivalent): return R::equivalent;
-        }
-        Q_UNREACHABLE_RETURN(R::unordered);
-#endif // __cpp_lib_bit_cast
-    }
-
     friend constexpr bool operator==(weak_ordering lhs, std::weak_ordering rhs) noexcept
     { return static_cast<std::weak_ordering>(lhs) == rhs; }
 
@@ -590,40 +567,6 @@ public:
 #endif // __cpp_lib_bit_cast
     }
 
-    constexpr Q_COMPARE_CAST_IMPLICIT operator std::weak_ordering() const noexcept
-    {
-        static_assert(sizeof(*this) == sizeof(std::weak_ordering));
-#ifdef __cpp_lib_bit_cast
-        return std::bit_cast<std::weak_ordering>(*this);
-#else
-        using O = QtPrivate::Ordering;
-        using R = std::weak_ordering;
-        switch (m_order) {
-        case qToUnderlying(O::Less):    return R::less;
-        case qToUnderlying(O::Greater): return R::greater;
-        case qToUnderlying(O::Equal):   return R::equivalent;
-        }
-        Q_UNREACHABLE_RETURN(R::equivalent);
-#endif // __cpp_lib_bit_cast
-    }
-
-    constexpr Q_COMPARE_CAST_IMPLICIT operator std::partial_ordering() const noexcept
-    {
-        static_assert(sizeof(*this) == sizeof(std::partial_ordering));
-#ifdef __cpp_lib_bit_cast
-        return std::bit_cast<std::partial_ordering>(*this);
-#else
-        using O = QtPrivate::Ordering;
-        using R = std::partial_ordering;
-        switch (m_order) {
-        case qToUnderlying(O::Less):    return R::less;
-        case qToUnderlying(O::Greater): return R::greater;
-        case qToUnderlying(O::Equal):   return R::equivalent;
-        }
-        Q_UNREACHABLE_RETURN(R::unordered);
-#endif // __cpp_lib_bit_cast
-    }
-
     friend constexpr bool operator==(strong_ordering lhs, std::strong_ordering rhs) noexcept
     { return static_cast<std::strong_ordering>(lhs) == rhs; }
 
@@ -979,8 +922,6 @@ inline constexpr QPartialOrdering QPartialOrdering::equivalent(QtPrivate::Orderi
 inline constexpr QPartialOrdering QPartialOrdering::greater(QtPrivate::Ordering::Greater);
 inline constexpr QPartialOrdering QPartialOrdering::unordered(QtPrivate::LegacyUncomparable::Unordered);
 
-#undef Q_COMPARE_CAST_IMPLICIT
-
 QT_END_NAMESPACE
 
 #endif // QCOMPARE_H
diff --git a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
index 30edd5f7345..8d764ad5257 100644
--- a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
+++ b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
@@ -693,20 +693,6 @@ void tst_QCompare::conversions()
         static_assert(Qt::partial_ordering::less == std::weak_ordering::less);
         static_assert(Qt::partial_ordering::equivalent == std::strong_ordering::equivalent);
         static_assert(Qt::partial_ordering::equivalent != std::strong_ordering::less);
-
-        // convert Qt::strong to std::partial
-        constexpr Qt::strong_ordering qtS = Qt::strong_ordering::less;
-        constexpr std::partial_ordering stdP1 = qtS;
-        static_assert(stdP1 == qtS);
-
-        // convert Qt::strong to std::weak
-        constexpr std::weak_ordering stdW = qtS;
-        static_assert(stdW == qtS);
-
-        // convert Qt::weak to std::partial
-        constexpr Qt::weak_ordering qtW = Qt::weak_ordering::greater;
-        constexpr std::partial_ordering stdP2 = qtW;
-        static_assert(stdP2 == qtW);
     }
 #endif