diff --git a/unsupported/Eigen/SparseExtra b/unsupported/Eigen/SparseExtra
index f73a085be..cc7c37324 100644
--- a/unsupported/Eigen/SparseExtra
+++ b/unsupported/Eigen/SparseExtra
@@ -38,9 +38,15 @@ namespace Eigen {
 #include "src/SparseExtra/RandomSetter.h"
 
 #include "src/SparseExtra/MarketIO.h"
-#include "src/SparseExtra/MatrixMarketIterator.h"
 } // namespace Eigen
 
+#if !defined(_WIN32)
+#include <dirent.h>
+namespace Eigen {
+#include "src/SparseExtra/MatrixMarketIterator.h"
+}
+#endif
+
 #include "../../Eigen/src/Core/util/ReenableStupidWarnings.h"
 
 #endif // EIGEN_SPARSE_EXTRA_MODULE_H
diff --git a/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h b/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
index fe8406ea4..322780ef9 100644
--- a/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
+++ b/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
@@ -1,4 +1,4 @@
- 
+
 // This file is part of Eigen, a lightweight C++ template library
 // for linear algebra.
 //
@@ -25,11 +25,6 @@
 #ifndef EIGEN_BROWSE_MATRICES_H
 #define EIGEN_BROWSE_MATRICES_H
 
-#include <dirent.h>
-#include <unsupported/Eigen/SparseExtra>
-using namespace Eigen;
-using std::string; 
-
 enum {
   SPD = 0x100,
   NonSymmetric = 0x0
@@ -63,7 +58,7 @@ class MatrixMarketIterator
     typedef SparseMatrix<Scalar,ColMajor> MatrixType; 
   
   public:
-    MatrixMarketIterator(const string folder):m_sym(0),m_isvalid(false),m_matIsLoaded(false),m_hasRhs(false),m_hasrefX(false),m_folder(folder)
+    MatrixMarketIterator(const std::string folder):m_sym(0),m_isvalid(false),m_matIsLoaded(false),m_hasRhs(false),m_hasrefX(false),m_folder(folder)
     {
       m_folder_id = opendir(folder.c_str());
       if (!m_folder_id){
@@ -95,7 +90,7 @@ class MatrixMarketIterator
       // Read the matrix
       if (m_matIsLoaded) return m_mat;
       
-      string matrix_file = m_folder + "/" + m_matname + ".mtx";
+      std::string matrix_file = m_folder + "/" + m_matname + ".mtx";
       if ( !loadMarket(m_mat, matrix_file)) 
       {
         m_matIsLoaded = false;
@@ -120,7 +115,7 @@ class MatrixMarketIterator
        // Get the right hand side
       if (m_hasRhs) return m_rhs;
       
-      string rhs_file;
+      std::string rhs_file;
       rhs_file = m_folder + "/" + m_matname + "_b.mtx"; // The pattern is matname_b.mtx
       m_hasRhs = Fileexists(rhs_file);
       if (m_hasRhs)
@@ -152,7 +147,7 @@ class MatrixMarketIterator
       // Check if a reference solution is provided
       if (m_hasrefX) return m_refX;
       
-      string lhs_file;
+      std::string lhs_file;
       lhs_file = m_folder + "/" + m_matname + "_x.mtx"; 
       m_hasrefX = Fileexists(lhs_file);
       if (m_hasrefX)
@@ -163,7 +158,7 @@ class MatrixMarketIterator
       return m_refX; 
     }
     
-    inline string& matname() { return m_matname; }
+    inline std::string& matname() { return m_matname; }
     
     inline int sym() { return m_sym; }
     
@@ -172,7 +167,7 @@ class MatrixMarketIterator
     
   protected:
     
-    inline bool Fileexists(string file)
+    inline bool Fileexists(std::string file)
     {
       std::ifstream file_id(file.c_str());
       if (!file_id.good() ) 
@@ -191,7 +186,7 @@ class MatrixMarketIterator
       // Here, we return with the next valid matrix in the folder
       while ( (m_curs_id = readdir(m_folder_id)) != NULL) {
         m_isvalid = false;
-        string curfile;
+        std::string curfile;
         curfile = m_folder + "/" + m_curs_id->d_name;
         // Discard if it is a folder
         if (m_curs_id->d_type == DT_DIR) continue; //FIXME This may not be available on non BSD systems
@@ -205,12 +200,12 @@ class MatrixMarketIterator
         if(isvector) continue;
         
         // Get the matrix name
-        string filename = m_curs_id->d_name;
+        std::string filename = m_curs_id->d_name;
         m_matname = filename.substr(0, filename.length()-4); 
         
         // Find if the matrix is SPD 
         size_t found = m_matname.find("SPD");
-        if( (found!=string::npos) && (m_sym == Symmetric) )
+        if( (found!=std::string::npos) && (m_sym == Symmetric) )
           m_sym = SPD;
        
         m_isvalid = true;
@@ -221,15 +216,15 @@ class MatrixMarketIterator
     MatrixType m_mat; // Current matrix  
     VectorType m_rhs;  // Current vector
     VectorType m_refX; // The reference solution, if exists
-    string m_matname; // Matrix Name
+    std::string m_matname; // Matrix Name
     bool m_isvalid; 
     bool m_matIsLoaded; // Determine if the matrix has already been loaded from the file
     bool m_hasRhs; // The right hand side exists
     bool m_hasrefX; // A reference solution is provided
-    string m_folder;
+    std::string m_folder;
     DIR * m_folder_id;
     struct dirent *m_curs_id; 
     
 };
 
-#endif
\ No newline at end of file
+#endif