diff --git a/src/EvtGenModels/EvtPhspFlatLifetime.cpp b/src/EvtGenModels/EvtPhspFlatLifetime.cpp
index 4458a5f..779fcbe 100644
--- a/src/EvtGenModels/EvtPhspFlatLifetime.cpp
+++ b/src/EvtGenModels/EvtPhspFlatLifetime.cpp
@@ -1,78 +1,78 @@
 
 /***********************************************************************
 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
 *                                                                      *
 * This file is part of EvtGen.                                         *
 *                                                                      *
 * EvtGen is free software: you can redistribute it and/or modify       *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * EvtGen is distributed in the hope that it will be useful,            *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with EvtGen.  If not, see <https://www.gnu.org/licenses/>.     *
 ***********************************************************************/
 
 #include "EvtGenModels/EvtPhspFlatLifetime.hh"
 
 #include "EvtGenBase/EvtGenKine.hh"
 #include "EvtGenBase/EvtPDL.hh"
 #include "EvtGenBase/EvtParticle.hh"
 #include "EvtGenBase/EvtPatches.hh"
 #include "EvtGenBase/EvtRandom.hh"
 #include "EvtGenBase/EvtReport.hh"
 
 #include <stdlib.h>
 #include <string>
 
 //==============================================================================
 // Return the name of the model
 //==============================================================================
 std::string EvtPhspFlatLifetime::getName()
 {
     return "PHSPFLATLIFETIME";
 }
 
 //==============================================================================
 // Copy the model
 //==============================================================================
 EvtDecayBase* EvtPhspFlatLifetime::clone()
 {
     return new EvtPhspFlatLifetime;
 }
 
 //==============================================================================
 // Initialize the model
 //==============================================================================
 void EvtPhspFlatLifetime::init()
 {
     // check that there is 1 argument in the decay file
     checkNArg( 1 );
     // this argument is the lifetime upper edge (in ps)
-    m_maxLifetime = getArg( 0 );
+    m_maxLifetime = getArg( 0 ) * EvtConst::c * 1.e-12;
 }
 
 //==============================================================================
 // Compute the maximum probability (max of the pdf)
 //==============================================================================
 void EvtPhspFlatLifetime::initProbMax()
 {
     noProbMax();
 }
 
 //==============================================================================
 // Decay the particle according to the model
 //==============================================================================
 void EvtPhspFlatLifetime::decay( EvtParticle* p )
 {
     p->initializePhaseSpace( getNDaug(), getDaugs() );
     // generate the lifetime flat between 0 and max
     double l = EvtRandom::Flat( 0., m_maxLifetime );
     // modify the lifetime of the particle (in mm)
-    p->setLifetime( l * EvtConst::c * 1.e-12 );
+    p->setLifetime( l );
 }