diff --git a/private/tooltip.cpp b/private/tooltip.cpp
index b2aca0e8a..fca9b6715 100644
--- a/private/tooltip.cpp
+++ b/private/tooltip.cpp
@@ -234,8 +234,9 @@ void ToolTip::hideEvent(QHideEvent *e)
     QWidget::hideEvent(e);
     d->animation->stop();
 
-    if (d->source) {
-        QMetaObject::invokeMethod(d->source.data(), "toolTipHidden");
+    QObject *source = d->source.data();
+    if (source && source->metaObject()->indexOfMethod("toolTipHidden()") != -1) {
+        QMetaObject::invokeMethod(source, "toolTipHidden");
     }
 
     WindowEffects::highlightWindows(winId(), QList<WId>());
diff --git a/tooltipmanager.cpp b/tooltipmanager.cpp
index 1e1508c06..5c3aac88f 100644
--- a/tooltipmanager.cpp
+++ b/tooltipmanager.cpp
@@ -364,13 +364,15 @@ void ToolTipManagerPrivate::showToolTip()
         return;
     }
 
-    // toolTipAboutToShow may call into methods such as setContent which play
-    // with the current widget; so let's just pretend for a moment that we don't have
-    // a current widget
-    QGraphicsWidget *temp = currentWidget;
-    currentWidget = 0;
-    QMetaObject::invokeMethod(temp, "toolTipAboutToShow");
-    currentWidget = temp;
+    if (currentWidget->metaObject()->indexOfMethod("toolTipAboutToShow()") != -1) {
+        // toolTipAboutToShow may call into methods such as setContent which play
+        // with the current widget; so let's just pretend for a moment that we don't have
+        // a current widget
+        QGraphicsWidget *temp = currentWidget;
+        currentWidget = 0;
+        QMetaObject::invokeMethod(temp, "toolTipAboutToShow");
+        currentWidget = temp;
+    }
 
     QHash<QGraphicsWidget *, ToolTipContent>::const_iterator tooltip = tooltips.constFind(currentWidget);