diff --git a/src/corelib/thread/qfuture.h b/src/corelib/thread/qfuture.h
index 7ae5c68bb9c..1f0c747f404 100644
--- a/src/corelib/thread/qfuture.h
+++ b/src/corelib/thread/qfuture.h
@@ -65,13 +65,7 @@ public:
     explicit QFuture(QFutureInterface<T> *p) // internal
         : d(*p)
     { }
-    QFuture(const QFuture &other)
-        : d(other.d)
-    { }
-    ~QFuture()
-    { }
 
-    inline QFuture &operator=(const QFuture &other);
     bool operator==(const QFuture &other) const { return (d == other.d); }
     bool operator!=(const QFuture &other) const { return (d != other.d); }
 
@@ -156,13 +150,6 @@ public: // Warning: the d pointer is not documented and is considered private.
     mutable QFutureInterface<T> d;
 };
 
-template <typename T>
-inline QFuture<T> &QFuture<T>::operator=(const QFuture<T> &other)
-{
-    d = other.d;
-    return *this;
-}
-
 template <typename T>
 inline T QFuture<T>::result() const
 {
@@ -195,13 +182,7 @@ public:
     explicit QFuture(QFutureInterfaceBase *p) // internal
         : d(*p)
     { }
-    QFuture(const QFuture &other)
-        : d(other.d)
-    { }
-    ~QFuture()
-    { }
 
-    QFuture &operator=(const QFuture &other);
     bool operator==(const QFuture &other) const { return (d == other.d); }
     bool operator!=(const QFuture &other) const { return (d != other.d); }
 
@@ -248,12 +229,6 @@ public:
     mutable QFutureInterfaceBase d;
 };
 
-inline QFuture<void> &QFuture<void>::operator=(const QFuture<void> &other)
-{
-    d = other.d;
-    return *this;
-}
-
 inline QFuture<void> QFutureInterface<void>::future()
 {
     return QFuture<void>(this);
diff --git a/src/corelib/thread/qfutureinterface.h b/src/corelib/thread/qfutureinterface.h
index 1787ff3b938..559d26e2314 100644
--- a/src/corelib/thread/qfutureinterface.h
+++ b/src/corelib/thread/qfutureinterface.h
@@ -285,21 +285,13 @@ template <>
 class QFutureInterface<void> : public QFutureInterfaceBase
 {
 public:
-    QFutureInterface<void>(State initialState = NoState)
+    explicit QFutureInterface<void>(State initialState = NoState)
         : QFutureInterfaceBase(initialState)
     { }
-    QFutureInterface<void>(const QFutureInterface<void> &other)
-        : QFutureInterfaceBase(other)
-    { }
 
     static QFutureInterface<void> canceledResult()
     { return QFutureInterface(State(Started | Finished | Canceled)); }
 
-    QFutureInterface<void> &operator=(const QFutureInterface<void> &other)
-    {
-        QFutureInterfaceBase::operator=(other);
-        return *this;
-    }
 
     inline QFuture<void> future(); // implemented in qfuture.h