diff --git a/src/calamares/progresstree/ProgressTreeDelegate.cpp b/src/calamares/progresstree/ProgressTreeDelegate.cpp
index 48b5b4328..388f4508c 100644
--- a/src/calamares/progresstree/ProgressTreeDelegate.cpp
+++ b/src/calamares/progresstree/ProgressTreeDelegate.cpp
@@ -25,50 +25,8 @@ item_fontsize()
     return CalamaresUtils::defaultFontSize() + 4;
 }
 
-QSize
-ProgressTreeDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
-{
-    if ( !index.isValid() )
-    {
-        return option.rect.size();
-    }
-
-    QFont font = qApp->font();
-
-    font.setPointSize( item_fontsize() );
-    QFontMetrics fm( font );
-    int height = fm.height();
-
-    height += 2 * item_margin;
-
-    return QSize( option.rect.width(), height );
-}
-
-
-void
-ProgressTreeDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
-{
-    QStyleOptionViewItem opt = option;
-
-    painter->save();
-
-    initStyleOption( &opt, index );
-    opt.text.clear();
-
-    painter->setBrush(
-        QColor( Calamares::Branding::instance()->styleString( Calamares::Branding::SidebarBackground ) ) );
-    painter->setPen( QColor( Calamares::Branding::instance()->styleString( Calamares::Branding::SidebarText ) ) );
-
-    paintViewStep( painter, opt, index );
-
-    painter->restore();
-}
-
-
-void
-ProgressTreeDelegate::paintViewStep( QPainter* painter,
-                                     const QStyleOptionViewItem& option,
-                                     const QModelIndex& index ) const
+static void
+paintViewStep( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index )
 {
     QRect textRect = option.rect.adjusted( item_margin, item_margin, -item_margin, -item_margin );
     QFont font = qApp->font();
@@ -122,3 +80,42 @@ ProgressTreeDelegate::paintViewStep( QPainter* painter,
         }
     } while ( shrinkSteps <= maximumShrink );
 }
+
+QSize
+ProgressTreeDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
+{
+    if ( !index.isValid() )
+    {
+        return option.rect.size();
+    }
+
+    QFont font = qApp->font();
+
+    font.setPointSize( item_fontsize() );
+    QFontMetrics fm( font );
+    int height = fm.height();
+
+    height += 2 * item_margin;
+
+    return QSize( option.rect.width(), height );
+}
+
+
+void
+ProgressTreeDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
+{
+    QStyleOptionViewItem opt = option;
+
+    painter->save();
+
+    initStyleOption( &opt, index );
+    opt.text.clear();
+
+    painter->setBrush(
+        QColor( Calamares::Branding::instance()->styleString( Calamares::Branding::SidebarBackground ) ) );
+    painter->setPen( QColor( Calamares::Branding::instance()->styleString( Calamares::Branding::SidebarText ) ) );
+
+    paintViewStep( painter, opt, index );
+
+    painter->restore();
+}
diff --git a/src/calamares/progresstree/ProgressTreeDelegate.h b/src/calamares/progresstree/ProgressTreeDelegate.h
index 55dcf7ac4..d5a5abcbc 100644
--- a/src/calamares/progresstree/ProgressTreeDelegate.h
+++ b/src/calamares/progresstree/ProgressTreeDelegate.h
@@ -26,9 +26,6 @@ public:
 protected:
     QSize sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const override;
     void paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const override;
-
-private:
-    void paintViewStep( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const;
 };
 
 #endif  // PROGRESSTREEDELEGATE_H