diff --git a/Eigen/src/SuperLUSupport/SuperLUSupport.h b/Eigen/src/SuperLUSupport/SuperLUSupport.h
index b9d5e48fb..1bbd2758e 100644
--- a/Eigen/src/SuperLUSupport/SuperLUSupport.h
+++ b/Eigen/src/SuperLUSupport/SuperLUSupport.h
@@ -165,8 +165,9 @@ struct SluMatrix : SuperMatrix
   }
 
   template<typename MatrixType>
-  static SluMatrix Map(SparseMatrixBase<MatrixType>& mat)
+  static SluMatrix Map(SparseMatrixBase<MatrixType>& a_mat)
   {
+    MatrixType &mat(a_mat.derived());
     SluMatrix res;
     if ((MatrixType::Flags&RowMajorBit)==RowMajorBit)
     {
@@ -184,9 +185,9 @@ struct SluMatrix : SuperMatrix
     res.Mtype       = SLU_GE;
 
     res.storage.nnz       = internal::convert_index<int>(mat.nonZeros());
-    res.storage.values    = mat.derived().valuePtr();
-    res.storage.innerInd  = mat.derived().innerIndexPtr();
-    res.storage.outerInd  = mat.derived().outerIndexPtr();
+    res.storage.values    = mat.valuePtr();
+    res.storage.innerInd  = mat.innerIndexPtr();
+    res.storage.outerInd  = mat.outerIndexPtr();
 
     res.setScalarType<typename MatrixType::Scalar>();
 
diff --git a/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h b/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
index e1284c782..54e0c5d63 100644
--- a/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
+++ b/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
@@ -361,7 +361,6 @@ struct evaluator<DynamicSparseMatrix<_Scalar,_Options,_StorageIndex> >
   : evaluator_base<DynamicSparseMatrix<_Scalar,_Options,_StorageIndex> >
 {
   typedef _Scalar Scalar;
-  typedef _StorageIndex Index;
   typedef DynamicSparseMatrix<_Scalar,_Options,_StorageIndex> SparseMatrixType;
   typedef typename SparseMatrixType::InnerIterator InnerIterator;
   typedef typename SparseMatrixType::ReverseInnerIterator ReverseInnerIterator;
@@ -378,6 +377,8 @@ struct evaluator<DynamicSparseMatrix<_Scalar,_Options,_StorageIndex> >
   operator const SparseMatrixType&() const { return *m_matrix; }
   
   Scalar coeff(Index row, Index col) const { return m_matrix->coeff(row,col); }
+  
+  Index nonZerosEstimate() const { return m_matrix->nonZeros(); }
 
   const SparseMatrixType *m_matrix;
 };