diff --git a/libsrc/occ/occgeom.hpp b/libsrc/occ/occgeom.hpp
index af61bd1f..59e5245c 100644
--- a/libsrc/occ/occgeom.hpp
+++ b/libsrc/occ/occgeom.hpp
@@ -232,6 +232,11 @@ namespace netgen
       if (prop2.col) col = prop2.col;
       maxh = min2(maxh, prop2.maxh);
     }
+
+    void DoArchive(Archive& ar)
+    {
+        ar & name & col & maxh & hpref;
+    }
   };