diff --git a/Eigen/src/Core/IO.h b/Eigen/src/Core/IO.h
index 94e00f58b..644228c3f 100644
--- a/Eigen/src/Core/IO.h
+++ b/Eigen/src/Core/IO.h
@@ -105,7 +105,7 @@ class WithFormat
     }
 
   protected:
-    const typename ExpressionType::Nested m_matrix;
+    typename ExpressionType::Nested m_matrix;
     IOFormat m_format;
 };
 
diff --git a/Eigen/src/SparseCore/SparseMatrixBase.h b/Eigen/src/SparseCore/SparseMatrixBase.h
index 813accce1..658ac0337 100644
--- a/Eigen/src/SparseCore/SparseMatrixBase.h
+++ b/Eigen/src/SparseCore/SparseMatrixBase.h
@@ -213,7 +213,7 @@ template<typename Derived> class SparseMatrixBase
 
       if (Flags&RowMajorBit)
       {
-        const Nested nm(m.derived());
+        Nested nm(m.derived());
         internal::evaluator<NestedCleaned> thisEval(nm);
         for (Index row=0; row<nm.outerSize(); ++row)
         {
@@ -232,7 +232,7 @@ template<typename Derived> class SparseMatrixBase
       }
       else
       {
-        const Nested nm(m.derived());
+        Nested nm(m.derived());
         internal::evaluator<NestedCleaned> thisEval(nm);
         if (m.cols() == 1) {
           Index row = 0;