diff --git a/src/corelib/tools/qsharedpointer_impl.h b/src/corelib/tools/qsharedpointer_impl.h
index f3df32469ff..7dafa4981cc 100644
--- a/src/corelib/tools/qsharedpointer_impl.h
+++ b/src/corelib/tools/qsharedpointer_impl.h
@@ -582,7 +582,7 @@ public:
     inline bool operator !() const { return isNull(); }
     inline T *data() const { return d == 0 || d->strongref.load() == 0 ? 0 : value; }
 
-    inline QWeakPointer() : d(0), value(0) { }
+    Q_DECL_CONSTEXPR inline QWeakPointer() : d(0), value(0) { }
     inline ~QWeakPointer() { if (d && !d->weakref.deref()) delete d; }
 
 #ifndef QT_NO_QOBJECT