1 files changed, 5 insertions, 1 deletions
diff --git a/drawinglayer/inc/drawinglayer/attribute/materialattribute3d.hxx b/drawinglayer/inc/drawinglayer/attribute/materialattribute3d.hxx
index cb64b0f9e330..9c4d34dce155 100644
--- a/drawinglayer/inc/drawinglayer/attribute/materialattribute3d.hxx
+++ b/drawinglayer/inc/drawinglayer/attribute/materialattribute3d.hxx
@@ -21,6 +21,7 @@
 #define INCLUDED_DRAWINGLAYER_ATTRIBUTE_MATERIALATTRIBUTE3D_HXX
 
 #include <drawinglayer/drawinglayerdllapi.h>
+#include <o3tl/cow_wrapper.hxx>
 
 //////////////////////////////////////////////////////////////////////////////
 // predefines
@@ -41,8 +42,11 @@ namespace drawinglayer
     {
         class DRAWINGLAYER_DLLPUBLIC MaterialAttribute3D
         {
+        public:
+            typedef o3tl::cow_wrapper< ImpMaterialAttribute3D > ImplType;
+
         private:
-            ImpMaterialAttribute3D*                             mpMaterialAttribute3D;
+            ImplType mpMaterialAttribute3D;
 
         public:
             // constructors/destructor