diff --git a/unsupported/Eigen/src/SparseExtra/MarketIO.h b/unsupported/Eigen/src/SparseExtra/MarketIO.h
index 1c40d3f7c..25ff4228d 100644
--- a/unsupported/Eigen/src/SparseExtra/MarketIO.h
+++ b/unsupported/Eigen/src/SparseExtra/MarketIO.h
@@ -133,6 +133,7 @@ template<typename SparseMatrixType>
 bool loadMarket(SparseMatrixType& mat, const std::string& filename)
 {
   typedef typename SparseMatrixType::Scalar Scalar;
+  typedef typename SparseMatrixType::Index Index;
   std::ifstream input(filename.c_str(),std::ios::in);
   if(!input)
     return false;
@@ -142,11 +143,11 @@ bool loadMarket(SparseMatrixType& mat, const std::string& filename)
   
   bool readsizes = false;
 
-  typedef Triplet<Scalar,int> T;
+  typedef Triplet<Scalar,Index> T;
   std::vector<T> elements;
   
-  int M(-1), N(-1), NNZ(-1);
-  int count = 0;
+  Index M(-1), N(-1), NNZ(-1);
+  Index count = 0;
   while(input.getline(buffer, maxBuffersize))
   {
     // skip comments   
@@ -169,7 +170,7 @@ bool loadMarket(SparseMatrixType& mat, const std::string& filename)
     }
     else
     { 
-      int i(-1), j(-1);
+      Index i(-1), j(-1);
       Scalar value; 
       if( internal::GetMarketLine(line, M, N, i, j, value) ) 
       {