diff --git a/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h b/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h
index b6fae9e6d..ba44487d0 100644
--- a/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h
+++ b/unsupported/Eigen/src/MatrixFunctions/MatrixPowerBase.h
@@ -154,10 +154,8 @@ struct traits<MatrixPowerProduct<Derived,_Lhs,_Rhs> >
   typedef typename remove_all<_Rhs>::type Rhs;
   typedef typename remove_all<MatrixPowerProduct<Derived,_Lhs,_Rhs> >::type PlainObject;
   typedef typename scalar_product_traits<typename Lhs::Scalar, typename Rhs::Scalar>::ReturnType Scalar;
-  typedef typename promote_storage_type<typename traits<Lhs>::StorageKind,
-					typename traits<Rhs>::StorageKind>::ret StorageKind;
-  typedef typename promote_index_type<typename traits<Lhs>::Index,
-				      typename traits<Rhs>::Index>::type Index;
+  typedef Dense StorageKind;
+  typedef typename promote_index_type<typename Lhs::Index, typename Rhs::Index>::type Index;
 
   enum {
     RowsAtCompileTime = traits<Lhs>::RowsAtCompileTime,