diff --git a/src/corelib/global/qcompare.h b/src/corelib/global/qcompare.h
index 41f2b2fd5a5..d82cf5ab4a4 100644
--- a/src/corelib/global/qcompare.h
+++ b/src/corelib/global/qcompare.h
@@ -155,11 +155,10 @@ public:
 
 #ifdef __cpp_lib_three_way_comparison
     constexpr Q_IMPLICIT partial_ordering(std::partial_ordering stdorder) noexcept
+        : m_order{} // == equivalent
     {
         if (stdorder == std::partial_ordering::less)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Less);
-        else if (stdorder == std::partial_ordering::equivalent)
-            m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Equivalent);
         else if (stdorder == std::partial_ordering::greater)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Greater);
         else if (stdorder == std::partial_ordering::unordered)
@@ -349,11 +348,10 @@ public:
 
 #ifdef __cpp_lib_three_way_comparison
     constexpr Q_IMPLICIT weak_ordering(std::weak_ordering stdorder) noexcept
+        : m_order{} // == equivalent
     {
         if (stdorder == std::weak_ordering::less)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Less);
-        else if (stdorder == std::weak_ordering::equivalent)
-            m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Equivalent);
         else if (stdorder == std::weak_ordering::greater)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Greater);
     }
@@ -545,13 +543,10 @@ public:
 
 #ifdef __cpp_lib_three_way_comparison
     constexpr Q_IMPLICIT strong_ordering(std::strong_ordering stdorder) noexcept
+        : m_order{} // == equivalent
     {
         if (stdorder == std::strong_ordering::less)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Less);
-        else if (stdorder == std::strong_ordering::equivalent)
-            m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Equivalent);
-        else if (stdorder == std::strong_ordering::equal)
-            m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Equal);
         else if (stdorder == std::strong_ordering::greater)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Greater);
     }
@@ -814,11 +809,10 @@ public:
 
 #ifdef __cpp_lib_three_way_comparison
     constexpr Q_IMPLICIT QPartialOrdering(std::partial_ordering stdorder) noexcept
+        : m_order{} // == equivalent
     {
         if (stdorder == std::partial_ordering::less)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Less);
-        else if (stdorder == std::partial_ordering::equivalent)
-            m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Equivalent);
         else if (stdorder == std::partial_ordering::greater)
             m_order = static_cast<QtPrivate::CompareUnderlyingType>(QtPrivate::Ordering::Greater);
         else if (stdorder == std::partial_ordering::unordered)