diff --git a/include/osg/Camera b/include/osg/Camera
index 3a6cbde0d..0a4ee2ecb 100644
--- a/include/osg/Camera
+++ b/include/osg/Camera
@@ -394,7 +394,7 @@ class OSG_EXPORT Camera : public Transform, public CullSettings
  
 
         /** Draw callback for custom operations.*/
-        struct DrawCallback : virtual public Object
+        struct OSG_EXPORT DrawCallback : virtual public Object
         {
             DrawCallback() {}