diff --git a/Resample/Particle/ReParticle.h b/Resample/Particle/ReParticle.h
index 9e2abd5d3984a4d5aea1f7b69911b02fcc5572f9..472cc5799ae95bb826865ab6aefe0254c80159a7 100644
--- a/Resample/Particle/ReParticle.h
+++ b/Resample/Particle/ReParticle.h
@@ -61,10 +61,9 @@ public:
 
     virtual complex_t formfactor_at_bottom(C3 q) const;
 
-protected:
+private:
     std::unique_ptr<const IFormFactor> m_ff;
 
-    // private:
     ReParticle(const std::optional<size_t>& i_layer, IFormFactor* ff, const Material* material,
                const Material* ambient_material, const R3* position, const RotMatrix* rotMatrix);