diff --git a/NPLib/GASPARD/TGaspardTrackerPhysics.cxx b/NPLib/GASPARD/TGaspardTrackerPhysics.cxx
index 69340326c2729b8bce3648219ee9ec5a21d2e900..ac7dd1823d5e5fc680d668a867186153ad86c00b 100644
--- a/NPLib/GASPARD/TGaspardTrackerPhysics.cxx
+++ b/NPLib/GASPARD/TGaspardTrackerPhysics.cxx
@@ -23,7 +23,9 @@
 
 #include "TGaspardTrackerPhysics.h"
 #include <iostream>
+#include <cstdlib>
 
+using namespace std ;
 
 ClassImp(TGaspardTrackerPhysics)
 
diff --git a/NPSimulation/src/DetectorConstruction.cc b/NPSimulation/src/DetectorConstruction.cc
index a09b3a79a8d1aa753634ca3f6ec0af70961bb97b..40f19eadb7511b1c660fe7e035f46dc7bad007da 100644
--- a/NPSimulation/src/DetectorConstruction.cc
+++ b/NPSimulation/src/DetectorConstruction.cc
@@ -288,7 +288,7 @@ void DetectorConstruction::ReadAllSensitive(const G4Event* event)
    if(m_Detectors.size()>0)
    m_Detectors[0]->GetInterCoordPointer()->Clear();
 
-   for (ushort i = 0 ; i < m_Detectors.size() ; i++) {
+   for (unsigned short i = 0 ; i < m_Detectors.size() ; i++) {
       m_Detectors[i]->ReadSensitive(event);
    }
 }