diff --git a/src/corelib/global/qcompare.h b/src/corelib/global/qcompare.h
index 682c1edd520..d2c4f54b163 100644
--- a/src/corelib/global/qcompare.h
+++ b/src/corelib/global/qcompare.h
@@ -706,6 +706,12 @@ public:
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::LegacyUncomparable::Unordered);
     }
 
+    constexpr Q_IMPLICIT QPartialOrdering(std::weak_ordering stdorder) noexcept
+        : QPartialOrdering(std::partial_ordering(stdorder)) {}
+
+    constexpr Q_IMPLICIT QPartialOrdering(std::strong_ordering stdorder) noexcept
+        : QPartialOrdering(std::partial_ordering(stdorder)) {}
+
     constexpr Q_IMPLICIT operator std::partial_ordering() const noexcept
     {
         if (static_cast<QtPrivate::Ordering>(m_order) == QtPrivate::Ordering::Less)
diff --git a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
index f07b2b89102..f473c1706d9 100644
--- a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
+++ b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
@@ -144,6 +144,8 @@ void tst_QCompare::legacyConversions()
         static_assert(QPartialOrdering::Unordered == NS ::partial_ordering::unordered); \
         \
         CHECK_CONVERTS(NS ::partial_ordering, QPartialOrdering); \
+        CHECK_CONVERTS(NS ::weak_ordering,    QPartialOrdering); \
+        CHECK_CONVERTS(NS ::strong_ordering,  QPartialOrdering); \
     } while (false)
 
 #ifdef __cpp_lib_three_way_comparison