diff --git a/include/osgShadow/MinimalDrawBoundsShadowMap b/include/osgShadow/MinimalDrawBoundsShadowMap
index 2be16938d..fadbdeeb8 100644
--- a/include/osgShadow/MinimalDrawBoundsShadowMap
+++ b/include/osgShadow/MinimalDrawBoundsShadowMap
@@ -78,6 +78,8 @@ class OSGSHADOW_EXPORT MinimalDrawBoundsShadowMap
             ViewData( void ): _boundAnalysisSize( 64, 64 ) {}
         };
 
+        friend struct ViewData;
+
         META_ViewDependentShadowTechniqueData( ThisClass, ThisClass::ViewData )
 
 
diff --git a/include/osgShadow/StandardShadowMap b/include/osgShadow/StandardShadowMap
index a8359260b..d451a7537 100644
--- a/include/osgShadow/StandardShadowMap
+++ b/include/osgShadow/StandardShadowMap
@@ -186,6 +186,8 @@ class OSGSHADOW_EXPORT StandardShadowMap : public DebugShadowMap
                 const osg::Vec3 &worldLightUp
                 = osg::Vec3(0,1,0) );
         };
+        
+        friend struct ViewData;
 
         META_ViewDependentShadowTechniqueData( ThisClass, ThisClass::ViewData )
 };