diff --git a/components/slider_p.h b/components/slider_p.h
index 645d8d1..3d04e10 100644
--- a/components/slider_p.h
+++ b/components/slider_p.h
@@ -14,8 +14,6 @@ class SliderPrivate
     Q_DISABLE_COPY(SliderPrivate)
     Q_DECLARE_PUBLIC(Slider)
 
-    friend class SliderThumb;
-
 public:
     SliderPrivate(Slider *parent);
 
diff --git a/components/sliderthumb.h b/components/sliderthumb.h
index 3d7cfbe..e4f0943 100644
--- a/components/sliderthumb.h
+++ b/components/sliderthumb.h
@@ -4,7 +4,6 @@
 #include <QWidget>
 
 class Slider;
-class SliderPrivate;
 
 class SliderThumb : public QWidget
 {
@@ -17,10 +16,8 @@ class SliderThumb : public QWidget
     Q_PROPERTY(qreal haloSize WRITE setHaloSize READ haloSize)
     Q_PROPERTY(QColor haloColor WRITE setHaloColor READ haloColor)
 
-    friend class SliderPrivate;
-    explicit SliderThumb(Slider *slider);
-
 public:
+    explicit SliderThumb(Slider *slider);
     ~SliderThumb();
 
     inline void setDiameter(qreal diameter)