diff --git a/ObjectTypes/Skeleton/SkeletonObject.cc b/ObjectTypes/Skeleton/SkeletonObject.cc
index 6d321ea4736781674ed162cc998d4fe3a928cb9d..d7d256bf7931e4377da569d9b098c8c8eed34dd3 100644
--- a/ObjectTypes/Skeleton/SkeletonObject.cc
+++ b/ObjectTypes/Skeleton/SkeletonObject.cc
@@ -64,6 +64,9 @@
 #include <OpenFlipper/common/Types.hh>
 #include "Skeleton.hh"
 
+#include <ACG/Scenegraph/MaterialNode.hh>
+#include <ACG/Scenegraph/SeparatorNode.hh>
+
 //== DEFINES ==================================================================
 
 //== TYPEDEFS =================================================================