diff --git a/libsrc/csg/splinesurface.cpp b/libsrc/csg/splinesurface.cpp
index 3d555c70..6134b1f4 100644
--- a/libsrc/csg/splinesurface.cpp
+++ b/libsrc/csg/splinesurface.cpp
@@ -96,4 +96,5 @@ void SplineSurface :: AppendPoint(const Point<3> & p, const double reffac, const
   str << "SplineSurface with base " << *baseprimitive << endl;
 }
 
+  static RegisterClassForArchive<SplineSurface, OneSurfacePrimitive> regss;
 }
diff --git a/libsrc/csg/splinesurface.hpp b/libsrc/csg/splinesurface.hpp
index e17f3eef..07a7eb8a 100644
--- a/libsrc/csg/splinesurface.hpp
+++ b/libsrc/csg/splinesurface.hpp
@@ -53,7 +53,11 @@ namespace netgen
 
     virtual INSOLID_TYPE BoxInSolid(const BoxSphere<3> & box) const
     { return baseprimitive->BoxInSolid(box); }
-    
+
+    virtual void DoArchive(Archive& ar)
+    {
+      ar & geompoints & splines & bcnames & maxh & baseprimitive & cuts & all_cuts;
+    }
     
     /*
     virtual void Project (Point<3> & p3d) const;