diff --git a/src/designer/src/lib/shared/previewmanager.cpp b/src/designer/src/lib/shared/previewmanager.cpp
index c46ac0303abe6234c9ff90a2cb3552ce1fcfdcf1..36e39b2e20684353841e17f1658f86f58e47bc76 100644
--- a/src/designer/src/lib/shared/previewmanager.cpp
+++ b/src/designer/src/lib/shared/previewmanager.cpp
@@ -811,7 +811,7 @@ QWidget *PreviewManager::raise(const QDesignerFormWindowInterface *fw, const Pre
 {
     typedef PreviewManagerPrivate::PreviewDataList PreviewDataList;
     if (d->m_previews.empty())
-        return false;
+        return 0;
 
     // find matching window
     const PreviewDataList::const_iterator cend =  d->m_previews.constEnd();
diff --git a/src/designer/src/lib/uilib/abstractformbuilder.cpp b/src/designer/src/lib/uilib/abstractformbuilder.cpp
index e406b276f046f4137bf7cccb213912bd7f6b1187..c0910752736d2812b9bcab32e9682f6224802d25 100644
--- a/src/designer/src/lib/uilib/abstractformbuilder.cpp
+++ b/src/designer/src/lib/uilib/abstractformbuilder.cpp
@@ -222,7 +222,7 @@ QWidget *QAbstractFormBuilder::load(QIODevice *dev, QWidget *parentWidget)
     d->m_errorString.clear();
     if (!readUiAttributes(reader, d->m_language, &d->m_errorString)) {
         uiLibWarning(d->m_errorString);
-        return false;
+        return 0;
     }
     DomUI ui;
     ui.read(reader);