diff --git a/owlps-positioning/inputcsv.cc b/owlps-positioning/inputcsv.cc
index bb9e7ac..de282bc 100644
--- a/owlps-positioning/inputcsv.cc
+++ b/owlps-positioning/inputcsv.cc
@@ -119,8 +119,8 @@ const Request& InputCSV::get_next_request()
   if (eof_close())
     {
       // End of file or error: blank current request
-      current_request.clear() ;
-      return current_request ;
+      current_request->clear() ;
+      return *current_request ;
     }
 
   // Split read string into fields (semicolon-separated)
@@ -133,8 +133,8 @@ const Request& InputCSV::get_next_request()
   if (ti == tok.end())
     {
       // Wrong number of fields: blank current request
-      current_request.clear() ;
-      return current_request ;
+      current_request->clear() ;
+      return *current_request ;
     }
 
   // If the mobile did not exist, we create it
@@ -146,19 +146,19 @@ const Request& InputCSV::get_next_request()
     {
       Stock::getw_mobile(*ti).set_mac_addr(*ti) ;
     }
-  current_request.set_mobile(&Stock::get_mobile(*ti)) ;
+  current_request->set_mobile(&Stock::get_mobile(*ti)) ;
 
   // Read Timestamp field
   if (++ti == tok.end())
     {
       // Wrong number of fields: blank current request
-      current_request.clear() ;
-      return current_request ;
+      current_request->clear() ;
+      return *current_request ;
     }
   try
     {
-      current_request.set_timestamp(Timestamp
-                                    (lexical_cast<uint64_t>(*ti))) ;
+      current_request->set_timestamp(Timestamp
+                                     (lexical_cast<uint64_t>(*ti))) ;
     }
   catch (bad_lexical_cast &e)
     {
@@ -167,8 +167,8 @@ const Request& InputCSV::get_next_request()
           << *ti << " » at line "
           << current_line_nb << ", field « Timestamp », of input file « "
           << input_file_name << " »!" << endl ;
-      current_request.clear() ; // Blank current request
-      return current_request ;
+      current_request->clear() ; // Blank current request
+      return *current_request ;
     }
 
   // Read position fields
@@ -179,8 +179,8 @@ const Request& InputCSV::get_next_request()
       if (++ti == tok.end())
         {
           // Wrong number of fields: blank current request
-          current_request.clear() ;
-          return current_request ;
+          current_request->clear() ;
+          return *current_request ;
         }
       try
         {
@@ -196,8 +196,8 @@ const Request& InputCSV::get_next_request()
               << current_line_nb << ", position field #" << i
               << ", of input file « " << input_file_name << " »!"
               << endl ;
-          current_request.clear() ; // Blank current request
-          return current_request ;
+          current_request->clear() ; // Blank current request
+          return *current_request ;
         }
     }
 
@@ -206,8 +206,8 @@ const Request& InputCSV::get_next_request()
   if (++ti == tok.end())
     {
       // Wrong number of fields: blank current request
-      current_request.clear() ;
-      return current_request ;
+      current_request->clear() ;
+      return *current_request ;
     }
   try
     {
@@ -222,8 +222,8 @@ const Request& InputCSV::get_next_request()
           << *ti << " » at line "
           << current_line_nb << ", field « Direction », of input file « "
           << input_file_name << " »!" << endl ;
-      current_request.clear() ; // Blank current request
-      return current_request ;
+      current_request->clear() ; // Blank current request
+      return *current_request ;
     }
 
   // Reading {MAC_AP;SS} couples
@@ -236,8 +236,8 @@ const Request& InputCSV::get_next_request()
       if (++ti == tok.end())
         {
           // Wrong number of fields: blank current request
-          current_request.clear() ;
-          return current_request ;
+          current_request->clear() ;
+          return *current_request ;
         }
 
       int ss ;
@@ -253,8 +253,8 @@ const Request& InputCSV::get_next_request()
               << current_line_nb
               << " of input file « " << input_file_name << " »!"
               << endl ;
-          current_request.clear() ; // Blank current request
-          return current_request ;
+          current_request->clear() ; // Blank current request
+          return *current_request ;
         }
 
       // If the AP did not exist, we create it
@@ -272,12 +272,12 @@ const Request& InputCSV::get_next_request()
       measurements[mac_ap].add_ss(ss) ;
     }
 
-  current_request.set_measurements(measurements) ;
+  current_request->set_measurements(measurements) ;
 
   read_next_line() ;
 
   if (is_calibration_request)
     {} // TODO
 
-  return current_request ;
+  return *current_request ;
 }
diff --git a/owlps-positioning/inputmedium.hh b/owlps-positioning/inputmedium.hh
index a031ccd..a921a9c 100644
--- a/owlps-positioning/inputmedium.hh
+++ b/owlps-positioning/inputmedium.hh
@@ -12,15 +12,14 @@ class InputMedium
 {
 protected:
   /// The Request just read
-  Request current_request ;
+  Request *current_request ;
   /// Number of the current line proceeded
   unsigned long current_line_nb ;
 
 public:
-  /// Default constructor
   InputMedium(void) ;
 
-  virtual ~InputMedium(void) {} ///< Destructor (do nothing)
+  virtual ~InputMedium(void) ;
 
   /** @name Read accessors */
   //@{
@@ -63,17 +62,24 @@ public:
 
 inline InputMedium::InputMedium()
 {
+  current_request = new Request() ;
   current_line_nb = 0 ;
 }
 
 
+inline InputMedium::~InputMedium()
+{
+  delete current_request ;
+}
+
+
 
 /* *** Read accessors *** */
 
 
 inline const Request& InputMedium::get_current_request() const
 {
-  return current_request ;
+  return *current_request ;
 }