diff --git a/Utilities/DataHelper/src/TrackExtended.cc b/Utilities/DataHelper/src/TrackExtended.cc
index edf9d43bb06afc488e8ae6b3cacf08e874c2e39c..8a8ce62847a4a93ec1d0bb26767362ffecaccc29 100644
--- a/Utilities/DataHelper/src/TrackExtended.cc
+++ b/Utilities/DataHelper/src/TrackExtended.cc
@@ -2,6 +2,7 @@
 #include "DataHelper/TrackerHitExtended.h"
 #include "DataHelper/TrackExtended.h"
 #include <math.h>
+#include <iostream>
 
 TrackExtended::TrackExtended( ) {
     _track = NULL;