diff --git a/src/gui/painting/qcolorspace.h b/src/gui/painting/qcolorspace.h
index 8b170a4e219..07f1ae4c318 100644
--- a/src/gui/painting/qcolorspace.h
+++ b/src/gui/painting/qcolorspace.h
@@ -124,7 +124,7 @@ public:
     operator QVariant() const;
 
 private:
-    Q_DECLARE_PRIVATE(QColorSpace)
+    friend class QColorSpacePrivate;
     QColorSpacePrivate *d_ptr = nullptr;
 
 #ifndef QT_NO_DEBUG_STREAM