diff --git a/Eigen/src/Core/MapBase.h b/Eigen/src/Core/MapBase.h
index b1cc3245d..5fab85ed7 100644
--- a/Eigen/src/Core/MapBase.h
+++ b/Eigen/src/Core/MapBase.h
@@ -98,6 +98,7 @@ template<typename Derived> class MapBase
       * \sa innerStride(), outerStride()
       */
     inline const Scalar* data() const { return m_data; }
+    inline Scalar* data() { return const_cast<Scalar*>(m_data); }
 
     inline const Scalar& coeff(Index row, Index col) const
     {
diff --git a/Eigen/src/Core/products/TriangularMatrixVector.h b/Eigen/src/Core/products/TriangularMatrixVector.h
index 06307f9d4..894a42b6c 100644
--- a/Eigen/src/Core/products/TriangularMatrixVector.h
+++ b/Eigen/src/Core/products/TriangularMatrixVector.h
@@ -177,7 +177,8 @@ struct TriangularProduct<Mode,true,Lhs,false,Rhs,true>
        typename _ActualLhsType::Scalar, LhsBlasTraits::NeedToConjugate,
        typename _ActualRhsType::Scalar, RhsBlasTraits::NeedToConjugate,
        (int(internal::traits<Lhs>::Flags)&RowMajorBit) ? RowMajor : ColMajor>
-      ::run(lhs.rows(),lhs.cols(),lhs.data(),lhs.outerStride(),rhs.data(),rhs.innerStride(),dst.data(),dst.innerStride(),actualAlpha);
+      ::run(lhs.rows(),lhs.cols(),lhs.data(),lhs.outerStride(),rhs.data(),rhs.innerStride(),
+                                  dst.data(),dst.innerStride(),actualAlpha);
   }
 };