diff --git a/Eigen/src/SparseCore/SparseBlock.h b/Eigen/src/SparseCore/SparseBlock.h
index 0e447f15f..13e8b0bf1 100644
--- a/Eigen/src/SparseCore/SparseBlock.h
+++ b/Eigen/src/SparseCore/SparseBlock.h
@@ -504,6 +504,7 @@ template<typename ArgType, int BlockRows, int BlockCols, bool InnerPanel>
 class unary_evaluator<Block<ArgType,BlockRows,BlockCols,InnerPanel>, IteratorBased>::InnerVectorInnerIterator
  : public EvalIterator
 {
+  enum { IsRowMajor = unary_evaluator::IsRowMajor };
   const XprType& m_block;
   Index m_end;
 public:
@@ -528,6 +529,7 @@ public:
 template<typename ArgType, int BlockRows, int BlockCols, bool InnerPanel>
 class unary_evaluator<Block<ArgType,BlockRows,BlockCols,InnerPanel>, IteratorBased>::OuterVectorInnerIterator
 {
+  enum { IsRowMajor = unary_evaluator::IsRowMajor };
   const unary_evaluator& m_eval;
   Index m_outerPos;
   Index m_innerIndex;