diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index f5bb2ad921f..4c3176e75d0 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -1925,6 +1925,7 @@ private:
 
 Q_DECLARE_TYPEINFO(QKeyCombination, Q_RELOCATABLE_TYPE);
 
+namespace Qt {
 constexpr QKeyCombination operator|(Qt::Modifier modifier, Qt::Key key) noexcept
 {
     return QKeyCombination(modifier, key);
@@ -2014,6 +2015,7 @@ constexpr QKeyCombination operator+(Qt::Key key, Qt::KeyboardModifiers modifiers
     return QKeyCombination(modifiers, key);
 }
 #endif
+}
 
 QT_END_NAMESPACE
 
diff --git a/src/corelib/global/qnamespace.qdoc b/src/corelib/global/qnamespace.qdoc
index 64da69c0ac1..231087350e7 100644
--- a/src/corelib/global/qnamespace.qdoc
+++ b/src/corelib/global/qnamespace.qdoc
@@ -3512,10 +3512,10 @@
 */
 
 /*!
-  \fn QKeyCombination operator|(Qt::Modifier modifier, Qt::Key key) noexcept
-  \fn QKeyCombination operator|(Qt::KeyboardModifier modifier, Qt::Key key) noexcept
-  \fn QKeyCombination operator|(Qt::Key key, Qt::Modifier modifier) noexcept
-  \fn QKeyCombination operator|(Qt::Key key, Qt::KeyboardModifier modifier) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Modifier modifier, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::KeyboardModifier modifier, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Key key, Qt::Modifier modifier) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Key key, Qt::KeyboardModifier modifier) noexcept
 
   \relates QKeyCombination
 
@@ -3524,10 +3524,10 @@
 */
 
 /*!
-  \fn QKeyCombination operator|(Qt::Modifiers modifiers, Qt::Key key) noexcept
-  \fn QKeyCombination operator|(Qt::KeyboardModifiers modifiers, Qt::Key key) noexcept
-  \fn QKeyCombination operator|(Qt::Key key, Qt::Modifiers modifiers) noexcept
-  \fn QKeyCombination operator|(Qt::Key key, Qt::KeyboardModifiers modifiers) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Modifiers modifiers, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::KeyboardModifiers modifiers, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Key key, Qt::Modifiers modifiers) noexcept
+  \fn QKeyCombination Qt::operator|(Qt::Key key, Qt::KeyboardModifiers modifiers) noexcept
 
   \relates QKeyCombination
 
@@ -3536,10 +3536,10 @@
 */
 
 /*!
-  \fn QKeyCombination operator+(Qt::Modifier modifier, Qt::Key key) noexcept
-  \fn QKeyCombination operator+(Qt::KeyboardModifier modifier, Qt::Key key) noexcept
-  \fn QKeyCombination operator+(Qt::Key key, Qt::Modifier modifier) noexcept
-  \fn QKeyCombination operator+(Qt::Key key, Qt::KeyboardModifier modifier) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Modifier modifier, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::KeyboardModifier modifier, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Key key, Qt::Modifier modifier) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Key key, Qt::KeyboardModifier modifier) noexcept
 
   \relates QKeyCombination
   \deprecated
@@ -3551,10 +3551,10 @@
 */
 
 /*!
-  \fn QKeyCombination operator+(Qt::Modifiers modifiers, Qt::Key key) noexcept
-  \fn QKeyCombination operator+(Qt::KeyboardModifiers modifiers, Qt::Key key) noexcept
-  \fn QKeyCombination operator+(Qt::Key key, Qt::Modifiers modifiers) noexcept
-  \fn QKeyCombination operator+(Qt::Key key, Qt::KeyboardModifiers modifiers) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Modifiers modifiers, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::KeyboardModifiers modifiers, Qt::Key key) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Key key, Qt::Modifiers modifiers) noexcept
+  \fn QKeyCombination Qt::operator+(Qt::Key key, Qt::KeyboardModifiers modifiers) noexcept
 
   \relates QKeyCombination
   \deprecated
diff --git a/tests/auto/corelib/global/qkeycombination/tst_qkeycombination.cpp b/tests/auto/corelib/global/qkeycombination/tst_qkeycombination.cpp
index 9941f8e1545..926f919ac9a 100644
--- a/tests/auto/corelib/global/qkeycombination/tst_qkeycombination.cpp
+++ b/tests/auto/corelib/global/qkeycombination/tst_qkeycombination.cpp
@@ -274,6 +274,17 @@ void tst_QKeyCombination::operator_or()
     QCOMPARE(Qt::ControlModifier | Qt::Key_Escape, QKeyCombination(Qt::ControlModifier, Qt::Key_Escape));
 }
 
+namespace QTBUG_126820 {
+struct S {};
+S operator|(S, S);
+S operator+(S, S);
+
+[[maybe_unused]] constexpr QKeyCombination kc1 = Qt::SHIFT | Qt::Key_A;
+#if QT_DEPRECATED_SINCE(6, 0)
+[[maybe_unused]] constexpr QKeyCombination kc2 = Qt::SHIFT + Qt::Key_A;
+#endif
+}
+
 QTEST_APPLESS_MAIN(tst_QKeyCombination)
 
 #include "tst_qkeycombination.moc"