diff --git a/src/lib/tools/tabstackedwidget.cpp b/src/lib/tools/tabstackedwidget.cpp
index 404491bd8..32c034386 100644
--- a/src/lib/tools/tabstackedwidget.cpp
+++ b/src/lib/tools/tabstackedwidget.cpp
@@ -80,11 +80,6 @@ void TabStackedWidget::setTabBar(ComboTabBar* tb)
     setUpLayout();
 }
 
-bool TabStackedWidget::isValid(int index)
-{
-    return (index < m_stack->count() && index >= 0);
-}
-
 void TabStackedWidget::tabWasRemoved(int index)
 {
     m_tabBar->removeTab(index);
@@ -168,7 +163,7 @@ void TabStackedWidget::keyPressEvent(QKeyEvent* event)
 
 void TabStackedWidget::showTab(int index)
 {
-    if (isValid(index)) {
+    if (validIndex(index)) {
         m_stack->setCurrentIndex(index);
     }
 
@@ -301,3 +296,8 @@ int TabStackedWidget::count() const
 {
     return m_tabBar->count();
 }
+
+bool TabStackedWidget::validIndex(int index) const
+{
+    return (index < m_stack->count() && index >= 0);
+}
diff --git a/src/lib/tools/tabstackedwidget.h b/src/lib/tools/tabstackedwidget.h
index 37777b1dd..16d5e728d 100644
--- a/src/lib/tools/tabstackedwidget.h
+++ b/src/lib/tools/tabstackedwidget.h
@@ -38,8 +38,6 @@ public:
     ComboTabBar* tabBar();
     void setTabBar(ComboTabBar* tb);
 
-    bool isValid(int index);
-
     bool documentMode() const;
     void setDocumentMode(bool enabled);
 
@@ -64,16 +62,14 @@ public:
     int indexOf(QWidget* widget) const;
     int count() const;
 
+signals:
+    void currentChanged(int index);
+    void tabCloseRequested(int index);
+
 public slots:
     void setCurrentIndex(int index);
     void setCurrentWidget(QWidget* widget);
 
-private:
-    QStackedWidget* m_stack;
-    ComboTabBar* m_tabBar;
-    QVBoxLayout* m_mainLayout;
-    bool m_dirtyTabBar;
-
 private slots:
     void tabWasRemoved(int index);
     void showTab(int index);
@@ -83,9 +79,13 @@ protected:
     bool eventFilter(QObject* obj, QEvent* event);
     void keyPressEvent(QKeyEvent* event);
 
-signals:
-    void currentChanged(int index);
-    void tabCloseRequested(int index);
+private:
+    bool validIndex(int index) const;
+
+    QStackedWidget* m_stack;
+    ComboTabBar* m_tabBar;
+    QVBoxLayout* m_mainLayout;
+    bool m_dirtyTabBar;
 };
 
 #endif // TABSTACKEDWIDGET_H