diff --git a/src/mirco_topology.cpp b/src/mirco_topology.cpp
index 8d17ab5..072851b 100644
--- a/src/mirco_topology.cpp
+++ b/src/mirco_topology.cpp
@@ -22,7 +22,7 @@ void MIRCO::ReadFile::GetSurface(Teuchos::SerialDenseMatrix<int, double> &z)
   }
   reader.close();
   z.shape(dimension, dimension);
-  int position = 0, separatorPosition, lineCounter = 0;
+  int separatorPosition, lineCounter = 0;
   std::ifstream stream(TopologyFilePath);
   std::string line, container;
   double value;
@@ -34,7 +34,6 @@ void MIRCO::ReadFile::GetSurface(Teuchos::SerialDenseMatrix<int, double> &z)
     {
       separatorPosition = line.find_first_of(';');
       container = line.substr(0, separatorPosition);
-      position += 1;
       line = line.substr(separatorPosition + 1, line.length());
       value = stod(container);
       z(lineCounter - 1, i) = value;
diff --git a/src/mirco_topology.h b/src/mirco_topology.h
index d49cd25..bb4b10a 100644
--- a/src/mirco_topology.h
+++ b/src/mirco_topology.h
@@ -22,6 +22,8 @@ namespace MIRCO
      */
     virtual void GetSurface(Teuchos::SerialDenseMatrix<int, double> &z) = 0;
     TopologyGeneration(int nn) { resolution = nn; }
+
+    virtual ~TopologyGeneration() = default;
   };
 
   class ReadFile : public TopologyGeneration