diff --git a/include/osg/ConvexPlanarPolygon b/include/osg/ConvexPlanarPolygon
index e5d10f165..8c4546b8b 100644
--- a/include/osg/ConvexPlanarPolygon
+++ b/include/osg/ConvexPlanarPolygon
@@ -20,9 +20,6 @@
 
 namespace osg {
 
-class BoundingBox;
-class BoundingSphere;
-
 /** A class for representing components of convex clipping volumes. */
 class OSG_EXPORT ConvexPlanarPolygon
 {