diff --git a/src/common/QskObjectCounter.h b/src/common/QskObjectCounter.h
index dafddb3e..5de71cc7 100644
--- a/src/common/QskObjectCounter.h
+++ b/src/common/QskObjectCounter.h
@@ -37,6 +37,8 @@ class QSK_EXPORT QskObjectCounter
     void dump() const;
 
   private:
+    Q_DISABLE_COPY( QskObjectCounter )
+
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;
 
diff --git a/src/controls/QskSkinlet.h b/src/controls/QskSkinlet.h
index bf97a6ff..534b00f0 100644
--- a/src/controls/QskSkinlet.h
+++ b/src/controls/QskSkinlet.h
@@ -167,6 +167,8 @@ class QSK_EXPORT QskSkinlet
         const QSizeF& hint, const QSizeF& constraint ) const;
 
   private:
+    Q_DISABLE_COPY( QskSkinlet )
+
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;
 };
diff --git a/src/controls/QskSkinnable.h b/src/controls/QskSkinnable.h
index 21f71e7f..06bb008d 100644
--- a/src/controls/QskSkinnable.h
+++ b/src/controls/QskSkinnable.h
@@ -240,6 +240,8 @@ class QSK_EXPORT QskSkinnable
     const QskSkinHintTable& hintTable() const;
 
   private:
+    Q_DISABLE_COPY( QskSkinnable )
+
     void startHintTransition( QskAspect,
         QskAnimationHint, QVariant from, QVariant to );
 
diff --git a/src/graphic/QskGraphicProviderMap.h b/src/graphic/QskGraphicProviderMap.h
index 6d9ec38f..119dab2c 100644
--- a/src/graphic/QskGraphicProviderMap.h
+++ b/src/graphic/QskGraphicProviderMap.h
@@ -30,6 +30,8 @@ class QSK_EXPORT QskGraphicProviderMap
     int size() const;
 
   private:
+    Q_DISABLE_COPY( QskGraphicProviderMap )
+
     class PrivateData;
     std::unique_ptr< PrivateData > m_data;
 };