diff --git a/src/corelib/thread/qmutex.h b/src/corelib/thread/qmutex.h
index 3e861ca0cb2..19463da6198 100644
--- a/src/corelib/thread/qmutex.h
+++ b/src/corelib/thread/qmutex.h
@@ -235,7 +235,7 @@ public:
 };
 
 template <typename Mutex>
-class QMutexLocker
+class [[nodiscard]] QMutexLocker
 {
 public:
     inline explicit QMutexLocker(Mutex *mutex) QT_MUTEX_LOCK_NOEXCEPT
@@ -313,7 +313,7 @@ private:
 class QRecursiveMutex : public QMutex {};
 
 template <typename Mutex>
-class QMutexLocker
+class [[nodiscard]] QMutexLocker
 {
 public:
     inline explicit QMutexLocker(Mutex *) noexcept {}
diff --git a/src/corelib/tools/qscopedpointer.h b/src/corelib/tools/qscopedpointer.h
index 5c72e7415df..43e0718699c 100644
--- a/src/corelib/tools/qscopedpointer.h
+++ b/src/corelib/tools/qscopedpointer.h
@@ -103,7 +103,7 @@ typedef QScopedPointerObjectDeleteLater<QObject> QScopedPointerDeleteLater;
 #endif
 
 template <typename T, typename Cleanup = QScopedPointerDeleter<T> >
-class QScopedPointer
+class [[nodiscard]] QScopedPointer
 {
 public:
     explicit QScopedPointer(T *p = nullptr) noexcept : d(p)
@@ -223,7 +223,7 @@ private:
 };
 
 template <typename T, typename Cleanup = QScopedPointerArrayDeleter<T> >
-class QScopedArrayPointer : public QScopedPointer<T, Cleanup>
+class [[nodiscard]] QScopedArrayPointer : public QScopedPointer<T, Cleanup>
 {
     template <typename Ptr>
     using if_same_type = typename std::enable_if<std::is_same<typename std::remove_cv<T>::type, Ptr>::value, bool>::type;