diff --git a/src/surface/surface_generator.hh b/src/surface/surface_generator.hh
index 8c07ecd..f14c8ac 100644
--- a/src/surface/surface_generator.hh
+++ b/src/surface/surface_generator.hh
@@ -1,72 +1,73 @@
 /**
  *  @file
  *  @section LICENSE
  *
  *  Copyright (©) 2016-2020 EPFL (École Polytechnique Fédérale de Lausanne),
  *  Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU Affero General Public License as published
  *  by the Free Software Foundation, either version 3 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU Affero General Public License for more details.
  *
  *  You should have received a copy of the GNU Affero General Public License
  *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
 
 /* -------------------------------------------------------------------------- */
 #ifndef SURFACE_GENERATOR_HH
 #define SURFACE_GENERATOR_HH
 /* -------------------------------------------------------------------------- */
 #include "grid.hh"
 #include <array>
 /* -------------------------------------------------------------------------- */
 
 namespace tamaas {
 
 /// Class generating random surfaces
 template <UInt dim>
 class SurfaceGenerator {
 public:
   /// Default constructor
   SurfaceGenerator() = default;
   /// Construct with surface global size
-  SurfaceGenerator(std::array<UInt, dim> global_size)
-      : global_size(std::move(global_size)) {}
+  SurfaceGenerator(std::array<UInt, dim> global_size) {
+    setSizes(std::move(global_size));
+  }
 
   /// Default destructor
   virtual ~SurfaceGenerator() = default;
 
 public:
   /// Build surface profile (array of heights)
   virtual Grid<Real, dim>& buildSurface() = 0;
   /// Set surface sizes
   void setSizes(std::array<UInt, dim> n);
   /// Set surface sizes
   void setSizes(const UInt n[dim]);
   /// Get surface sizes
   auto getSizes() const { return global_size; }
 
   long getRandomSeed() const { return random_seed; }
   void setRandomSeed(long seed);
 
-  /// Maintaining old interface
+  /// TODO [legacy] remove
   friend class SurfaceGeneratorFilterFFT;
 
 protected:
   Grid<Real, dim> grid;
   std::array<UInt, dim> global_size{0};
   long random_seed = 0;
 };
 
 /* -------------------------------------------------------------------------- */
 
 }  // namespace tamaas
 
 #endif  // __SURFACE_GENERATOR_HH__