diff --git a/include/osg/Drawable b/include/osg/Drawable
index 1f616f6f7..ba68a99d5 100644
--- a/include/osg/Drawable
+++ b/include/osg/Drawable
@@ -317,7 +317,7 @@ class SG_EXPORT Drawable : public Object
             META_Object(osg,DrawCallback)
 
             /** do customized draw code.*/
-            virtual void drawImplementation(State&,const osg::Drawable*) const {}
+            virtual void drawImplementation(osg::State&,const osg::Drawable*) const {}
         };
 
         /** Set the DrawCallback which allows users to attach customize the drawing of existing Drawable object.*/