diff --git a/src/widgets/kernel/qtooltip.h b/src/widgets/kernel/qtooltip.h
index 2b73695a52..860a2ccab0 100644
--- a/src/widgets/kernel/qtooltip.h
+++ b/src/widgets/kernel/qtooltip.h
@@ -53,7 +53,7 @@ QT_BEGIN_NAMESPACE
 
 class Q_WIDGETS_EXPORT QToolTip
 {
-    QToolTip();
+    QToolTip() Q_DECL_EQ_DELETE;
 public:
     static void showText(const QPoint &pos, const QString &text, QWidget *w = 0);
     static void showText(const QPoint &pos, const QString &text, QWidget *w, const QRect &rect);
diff --git a/src/widgets/kernel/qwhatsthis.cpp b/src/widgets/kernel/qwhatsthis.cpp
index 95e1683c26..ed2d77021c 100644
--- a/src/widgets/kernel/qwhatsthis.cpp
+++ b/src/widgets/kernel/qwhatsthis.cpp
@@ -521,11 +521,6 @@ void QWhatsThisAction::actionTriggered()
     }
 }
 
-QWhatsThis::QWhatsThis()
-{
-}
-
-
 /*!
     This function switches the user interface into "What's This?"
     mode. The user interface can be switched back into normal mode by
diff --git a/src/widgets/kernel/qwhatsthis.h b/src/widgets/kernel/qwhatsthis.h
index 2583e3bb62..e901b474fd 100644
--- a/src/widgets/kernel/qwhatsthis.h
+++ b/src/widgets/kernel/qwhatsthis.h
@@ -56,7 +56,7 @@ class QAction;
 
 class Q_WIDGETS_EXPORT QWhatsThis
 {
-    QWhatsThis();
+    QWhatsThis() Q_DECL_EQ_DELETE;
 
 public:
     static void enterWhatsThisMode();