diff --git a/src/plugins/coreplugin/manhattanstyle.cpp b/src/plugins/coreplugin/manhattanstyle.cpp
index 87d108f5a66..f4c95e8f004 100644
--- a/src/plugins/coreplugin/manhattanstyle.cpp
+++ b/src/plugins/coreplugin/manhattanstyle.cpp
@@ -315,19 +315,6 @@ void ManhattanStyle::polish(QPalette &pal)
     QProxyStyle::polish(pal);
 }
 
-QIcon ManhattanStyle::standardIconImplementation(StandardPixmap standardIcon, const QStyleOption *option, const QWidget *widget) const
-{
-    QIcon icon;
-    switch (standardIcon) {
-    case QStyle::SP_TitleBarCloseButton:
-    case QStyle::SP_ToolBarHorizontalExtensionButton:
-        return QIcon(standardPixmap(standardIcon, option, widget));
-    default:
-        icon = baseStyle()->standardIcon(standardIcon, option, widget);
-    }
-    return icon;
-}
-
 QPixmap ManhattanStyle::standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt,
                                        const QWidget *widget) const
 {
diff --git a/src/plugins/coreplugin/manhattanstyle.h b/src/plugins/coreplugin/manhattanstyle.h
index 72827a9f017..1d9d766b72a 100644
--- a/src/plugins/coreplugin/manhattanstyle.h
+++ b/src/plugins/coreplugin/manhattanstyle.h
@@ -71,9 +71,6 @@ public:
     void unpolish(QWidget *widget);
     void unpolish(QApplication *app);
 
-protected slots:
-    QIcon standardIconImplementation(StandardPixmap standardIcon, const QStyleOption *option, const QWidget *widget) const;
-
 private:
     void drawButtonSeparator(QPainter *painter, const QRect &rect, bool reverse) const;