diff --git a/src/SingleLayerOptics/src/MaterialDescription.cpp b/src/SingleLayerOptics/src/MaterialDescription.cpp
index 9782f1fe..b1e293b5 100644
--- a/src/SingleLayerOptics/src/MaterialDescription.cpp
+++ b/src/SingleLayerOptics/src/MaterialDescription.cpp
@@ -121,6 +121,12 @@ namespace SingleLayerOptics
         return m_Surface.at(t_Side)->getProperty(t_Property);
     }
 
+    double RMaterialProperties::operator()(FenestrationCommon::Property t_Property,
+                                           FenestrationCommon::Side t_Side) const
+    {
+        return getProperty(t_Property, t_Side);
+    }
+
     ////////////////////////////////////////////////////////////////////////////////////
     ////   CMaterial
     ////////////////////////////////////////////////////////////////////////////////////
diff --git a/src/SingleLayerOptics/src/MaterialDescription.hpp b/src/SingleLayerOptics/src/MaterialDescription.hpp
index 5e83fd60..a74b3c44 100644
--- a/src/SingleLayerOptics/src/MaterialDescription.hpp
+++ b/src/SingleLayerOptics/src/MaterialDescription.hpp
@@ -38,8 +38,11 @@ namespace SingleLayerOptics
     {
     public:
         RMaterialProperties(double aTf, double aTb, double aRf, double aRb);
-        double getProperty(FenestrationCommon::Property t_Property,
-                           FenestrationCommon::Side t_Side) const;
+        [[nodiscard]] double getProperty(FenestrationCommon::Property t_Property,
+                                         FenestrationCommon::Side t_Side) const;
+        [[nodiscard]] double operator()(FenestrationCommon::Property t_Property,
+                                        FenestrationCommon::Side t_Side) const;
+
 
     private:
         std::map<FenestrationCommon::Side, std::shared_ptr<CSurface>> m_Surface;
diff --git a/src/SingleLayerOptics/src/VenetianCell.cpp b/src/SingleLayerOptics/src/VenetianCell.cpp
index 78d82d6b..1102dbc5 100644
--- a/src/SingleLayerOptics/src/VenetianCell.cpp
+++ b/src/SingleLayerOptics/src/VenetianCell.cpp
@@ -64,13 +64,14 @@ namespace SingleLayerOptics
             size_t size = m_Material->getBandSize();
             for(size_t i = 0; i < size; ++i)
             {
-                double Tf = aMat[i].getProperty(Property::T, Side::Front);
-                double Tb = aMat[i].getProperty(Property::T, Side::Back);
-                double Rf = aMat[i].getProperty(Property::R, Side::Front);
-                double Rb = aMat[i].getProperty(Property::R, Side::Back);
-
-                m_EnergiesBand.emplace_back(
-                  LayerProperties{Tf, Rf, Tb, Rb}, venetianForwardGeometry, m_BackwardFlowCellDescription);
+                double Tf = aMat[i](Property::T, Side::Front);
+                double Tb = aMat[i](Property::T, Side::Back);
+                double Rf = aMat[i](Property::R, Side::Front);
+                double Rb = aMat[i](Property::R, Side::Back);
+
+                m_EnergiesBand.emplace_back(LayerProperties{Tf, Rf, Tb, Rb},
+                                            venetianForwardGeometry,
+                                            m_BackwardFlowCellDescription);
             }
         }
     }