diff --git a/src/plugins/designer/editorwidget.cpp b/src/plugins/designer/editorwidget.cpp
index 0e0f1ca817c7664881e0f80269c5fc0b5c29b402..5ad16aedf83985b7c8cbabae23620ebaf1551302 100644
--- a/src/plugins/designer/editorwidget.cpp
+++ b/src/plugins/designer/editorwidget.cpp
@@ -170,6 +170,7 @@ EditorWidget::EditorWidget(QWidget *formWindow) :
     if (wantSignalSlotEditor) {
         m_bottomTab = new QTabWidget;
         m_bottomTab->setTabPosition(QTabWidget::South);
+        m_bottomTab->setDocumentMode(true);
         m_bottomTab->addTab(m_designerSubWindows[ActionEditorSubWindow], tr("Action editor"));
         m_bottomTab->addTab(m_designerSubWindows[SignalSlotEditorSubWindow], tr("Signals and slots editor"));
         m_centerVertSplitter->addWidget(m_bottomTab);