diff --git a/src/TNL/Matrices/SparseMatrixView.h b/src/TNL/Matrices/SparseMatrixView.h
index ba73ea651f5fd36fdf72a524139043d9ad3cbef5..29371c802840c2badda8f69ca8f5c6e1c7152aa2 100644
--- a/src/TNL/Matrices/SparseMatrixView.h
+++ b/src/TNL/Matrices/SparseMatrixView.h
@@ -98,7 +98,7 @@ class SparseMatrixView : public MatrixView< Real, Device, Index >
       /**
        * \brief The type of matrix elements.
        */
-      using RealType = Real;
+      using RealType = std::remove_const_t< Real >;
 
       using ComputeRealType = ComputeReal;
 
@@ -942,7 +942,7 @@ class SparseMatrixView : public MatrixView< Real, Device, Index >
       }
 };
 
-} // namespace Conatiners
+   } // namespace Matrices
 } // namespace TNL
 
 #include <TNL/Matrices/SparseMatrixView.hpp>
diff --git a/src/TNL/Matrices/SparseMatrixView.hpp b/src/TNL/Matrices/SparseMatrixView.hpp
index 72377f8478ab73443383899d7fc7371965d2b458..63220888affebab801edbce497034b2b8ca6f175 100644
--- a/src/TNL/Matrices/SparseMatrixView.hpp
+++ b/src/TNL/Matrices/SparseMatrixView.hpp
@@ -80,8 +80,8 @@ getConstView() const -> ConstViewType
    return ConstViewType( this->getRows(),
                          this->getColumns(),
                          this->getValues().getConstView(),
-                         this->getColumnsIndexes().getConstView(),
-                         this->segments.getConstView() );
+                         this->getColumnIndexes().getConstView(),
+                         const_cast< SparseMatrixView* >( this )->segments.getView() );
 }
 
 template< typename Real,
@@ -862,14 +862,12 @@ SparseMatrixView< Real, Device, Index, MatrixType, SegmentsView, ComputeReal >::
 operator==( const Matrix& m ) const
 {
    const auto& view1 = *this;
-   // FIXME: getConstView does not work
-   //const auto view2 = m.getConstView();
-   const auto view2 = m.getView();
+   const auto view2 = m.getConstView();
    auto fetch = [=] __cuda_callable__ ( const IndexType i ) -> bool
    {
       return view1.getRow( i ) == view2.getRow( i );
    };
-   return Algorithms::reduce< DeviceType >( (IndexType) 0, this->getRows(), fetch, std::logical_and<>{}, true );
+   return Algorithms::reduce< DeviceType >( ( IndexType ) 0, this->getRows(), fetch, std::logical_and<>{}, true );
 }
 
 template< typename Real,
@@ -896,7 +894,7 @@ void
 SparseMatrixView< Real, Device, Index, MatrixType, SegmentsView, ComputeReal >::
 save( File& file ) const
 {
-   MatrixView< RealType, DeviceType, IndexType >::save( file );
+   MatrixView< Real, Device, Index >::save( file );
    file << this->columnIndexes;
    this->segments.save( file );
 }