avoid warning

diff --git a/include/deal.II/grid/reference_cell.h b/include/deal.II/grid/reference_cell.h
index abf78f3fd38d11504cd80f987c1c3d73a169dabb..5fa19e26fa1f7a5c1e82f0ea5e11a54fec94d49d 100644 (file)
--- a/include/deal.II/grid/reference_cell.h
+++ b/include/deal.II/grid/reference_cell.h
@@ -1007,7 +1007,7 @@ ReferenceCell::n_lines() const
     return 12;
 
   Assert(false, ExcNotImplemented());
-  return numbers::invalid_unsigned_int;
+  return 0;
 }