diff --git a/owlps-positioner/src/inputudpsocket.cc b/owlps-positioner/src/inputudpsocket.cc
index 1000cd5..daa8bbd 100644
--- a/owlps-positioner/src/inputudpsocket.cc
+++ b/owlps-positioner/src/inputudpsocket.cc
@@ -126,7 +126,7 @@ bool InputUDPSocket::fill_current_request()
 
   // Display request's info
   if (Configuration::is_configured("verbose"))
-    cout
+    cerr
         << "*** Request received from the aggregator ***"
         << "\n\tType: " << static_cast<uint_fast16_t>(request.type)
         << "\n\tNumber of packets: " << request.nb_packets
@@ -146,7 +146,7 @@ bool InputUDPSocket::fill_current_request()
       ! Stock::mobile_exists(mac_mobile))
     {
       if (Configuration::is_configured("verbose"))
-        cout << "Dropping request from unknown mobile "
+        cerr << "Dropping request from unknown mobile "
              << mac_mobile << ".\n" ;
       return false ;
     }
@@ -199,7 +199,7 @@ bool InputUDPSocket::fill_current_request()
       ss_t ss = request_info.ss_dbm - 256 ;
 
       if (Configuration::is_configured("verbose"))
-        cout
+        cerr
             << "\t* Packet received from the aggregator:"
             << "\n\t\tPacket number: " << packet_id
             << "\n\t\tAP MAC: " << mac_ap
@@ -212,7 +212,7 @@ bool InputUDPSocket::fill_current_request()
           ! Stock::ap_exists(mac_ap))
         {
           if (Configuration::is_configured("verbose"))
-            cout << "Dropping packet from unknown AP "
+            cerr << "Dropping packet from unknown AP "
                  << mac_ap << ".\n" ;
           continue ;
         }