diff --git a/Ecal/src/Ecal/EcalVetoProcessor.cxx b/Ecal/src/Ecal/EcalVetoProcessor.cxx
index 72d76e2c5..541b36c04 100644
--- a/Ecal/src/Ecal/EcalVetoProcessor.cxx
+++ b/Ecal/src/Ecal/EcalVetoProcessor.cxx
@@ -744,6 +744,7 @@ void EcalVetoProcessor::produce(framework::Event &event) {
     TVector3 e_norm = evec.Unit();
     TVector3 pvec = p_traj_end - p_traj_start;
     TVector3 p_norm = pvec.Unit();
+    epDot_ = e_norm.Dot(p_norm);
     epAng_ = acos(epDot_) * 180.0 / M_PI;
     epSep_ = sqrt(pow(e_traj_start.X() - p_traj_start.X(), 2) +
                   pow(e_traj_start.Y() - p_traj_start.Y(), 2));