diff --git a/src/layouts/QskGridLayoutEngine.h b/src/layouts/QskGridLayoutEngine.h
index 3ea9a164..37a63ef7 100644
--- a/src/layouts/QskGridLayoutEngine.h
+++ b/src/layouts/QskGridLayoutEngine.h
@@ -16,7 +16,7 @@ class QQuickItem;
 class QSizeF;
 class QRectF;
 
-class QskGridLayoutEngine : public QskLayoutEngine2D
+class QSK_EXPORT QskGridLayoutEngine : public QskLayoutEngine2D
 {
   public:
     QskGridLayoutEngine();
@@ -61,8 +61,8 @@ class QskGridLayoutEngine : public QskLayoutEngine2D
 
     void invalidateElementCache() override;
 
-    void setupChain( Qt::Orientation,
-        const QskLayoutChain::Segments&, QskLayoutChain& ) const override;
+    void setupChain( Qt::Orientation, const QskLayoutChain::Segments&,
+        QskLayoutChain& ) const override final;
 
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;
diff --git a/src/layouts/QskLayoutElement.h b/src/layouts/QskLayoutElement.h
index 55691bfc..4bebca0b 100644
--- a/src/layouts/QskLayoutElement.h
+++ b/src/layouts/QskLayoutElement.h
@@ -13,7 +13,7 @@
 class QskSizePolicy;
 class QskLayoutMetrics;
 
-class QskLayoutElement
+class QSK_EXPORT QskLayoutElement
 {
   public:
     QskLayoutElement();
@@ -54,7 +54,7 @@ inline qreal QskLayoutElement::widthForHeight( qreal height ) const
 
 class QQuickItem;
 
-class QskItemLayoutElement final : public QskLayoutElement
+class QSK_EXPORT QskItemLayoutElement final : public QskLayoutElement
 {
   public:
     QskItemLayoutElement( const QQuickItem* );
diff --git a/src/layouts/QskLayoutEngine2D.h b/src/layouts/QskLayoutEngine2D.h
index df961136..d468c24c 100644
--- a/src/layouts/QskLayoutEngine2D.h
+++ b/src/layouts/QskLayoutEngine2D.h
@@ -15,7 +15,7 @@
 
 class QskLayoutElement;
 
-class QskLayoutEngine2D
+class QSK_EXPORT QskLayoutEngine2D
 {
   public:
     QskLayoutEngine2D();
diff --git a/src/layouts/QskLinearLayoutEngine.h b/src/layouts/QskLinearLayoutEngine.h
index f402c8dc..799cd021 100644
--- a/src/layouts/QskLinearLayoutEngine.h
+++ b/src/layouts/QskLinearLayoutEngine.h
@@ -16,7 +16,7 @@ class QQuickItem;
 class QSizeF;
 class QRectF;
 
-class QskLinearLayoutEngine : public QskLayoutEngine2D
+class QSK_EXPORT QskLinearLayoutEngine : public QskLayoutEngine2D
 {
   public:
     QskLinearLayoutEngine( Qt::Orientation, uint dimension );
@@ -58,8 +58,8 @@ class QskLinearLayoutEngine : public QskLayoutEngine2D
 
     void invalidateElementCache() override;
 
-    virtual void setupChain( Qt::Orientation,
-        const QskLayoutChain::Segments&, QskLayoutChain& ) const override;
+    virtual void setupChain( Qt::Orientation, const QskLayoutChain::Segments&,
+        QskLayoutChain& ) const override final;
 
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;