diff --git a/NPLib/ComptonTelescope/TComptonTelescopePhysics.h b/NPLib/ComptonTelescope/TComptonTelescopePhysics.h
index 5b9a572acd47b4a90ac9a968593f4bf7240db356..ed2067192cea5e54a07174d3f3d03021be617fe8 100644
--- a/NPLib/ComptonTelescope/TComptonTelescopePhysics.h
+++ b/NPLib/ComptonTelescope/TComptonTelescopePhysics.h
@@ -22,22 +22,23 @@
  *                                                                           *
  *                                                                           *
  *****************************************************************************/
+// STL
+#include <vector>
+using namespace std;
 
 // NPL
 #include "TComptonTelescopeData.h"
 #include "TComptonTelescopeSpectra.h"
+
 #include "NPCalibrationManager.h"
 #include "NPVDetector.h"
+#include "NPDetectorFactory.h"
 
 // ROOT 
 #include "TVector2.h" 
 #include "TVector3.h" 
 #include "TObject.h"
 
-// STL
-#include <vector>
-using namespace std;
-
 // forward declaration
 class TComptonTelescopeSpectra;