diff --git a/source/LumiCalReco/include/LumiCalClusterer.h b/source/LumiCalReco/include/LumiCalClusterer.h
index b83fa95..dd666dd 100644
--- a/source/LumiCalReco/include/LumiCalClusterer.h
+++ b/source/LumiCalReco/include/LumiCalClusterer.h
@@ -25,6 +25,11 @@
 #include <string>
 #include <memory>
 
+enum RETVAL {
+  NOK = 0,
+  OK = 1,
+};
+
 namespace EVENT {
   class CalorimeterHit;
   class LCEvent;
@@ -45,7 +50,7 @@ class LumiCalClustererClass {
   void setCutOnFiducialVolume( bool cutFlag ) { _cutOnFiducialVolume = cutFlag; }
 
   // main actions in each event -Called for every event - the working horse.
-  int processEvent( EVENT::LCEvent * evt ) ;
+  RETVAL processEvent( EVENT::LCEvent * evt ) ;
 
   MapIntMapIntVInt       _superClusterIdToCellId;
   MapIntMapIntVDouble    _superClusterIdToCellEngy;
diff --git a/source/LumiCalReco/src/LumiCalClusterer.cpp b/source/LumiCalReco/src/LumiCalClusterer.cpp
index eb14053..ad6f601 100644
--- a/source/LumiCalReco/src/LumiCalClusterer.cpp
+++ b/source/LumiCalReco/src/LumiCalClusterer.cpp
@@ -154,9 +154,7 @@ void LumiCalClustererClass::init( GlobalMethodsClass const& gmc ){
 /* ============================================================================
    main actions in each event:
    ========================================================================= */
-int LumiCalClustererClass::processEvent( EVENT::LCEvent * evt ) {
-  int OK = 1;
-  int NOK = 0;
+RETVAL LumiCalClustererClass::processEvent( EVENT::LCEvent * evt ) {
   // increment / initialize global variables
   _totEngyArm[-1] = _totEngyArm[1] = 0.;
   _numHitsInArm[-1] = _numHitsInArm[1] = 0;
@@ -175,7 +173,7 @@ int LumiCalClustererClass::processEvent( EVENT::LCEvent * evt ) {
      of IMPL::CalorimeterHitImpl. Hits are split in two std::vectors, one for each arm
      of LumiCal.
      -------------------------------------------------------------------------- */
-  if ( !getCalHits(evt , calHits) ) return NOK;
+  if ( !getCalHits(evt , calHits) ) return RETVAL::NOK;
 
 
   /* --------------------------------------------------------------------------
@@ -258,6 +256,6 @@ int LumiCalClustererClass::processEvent( EVENT::LCEvent * evt ) {
     }
   }
 
-  return OK;
+  return RETVAL::OK;
 
 }
diff --git a/source/LumiCalReco/src/MarlinLumiCalClusterer.cpp b/source/LumiCalReco/src/MarlinLumiCalClusterer.cpp
index 65ae183..1bff862 100644
--- a/source/LumiCalReco/src/MarlinLumiCalClusterer.cpp
+++ b/source/LumiCalReco/src/MarlinLumiCalClusterer.cpp
@@ -57,7 +57,7 @@ void MarlinLumiCalClusterer::TryMarlinLumiCalClusterer(EVENT::LCEvent* evt) {
        create clusters using: LumiCalClustererClass
        -------------------------------------------------------------------------- */
 
-    bool stat = LumiCalClusterer.processEvent(evt);
+    RETVAL status = LumiCalClusterer.processEvent(evt);
 
     LCCollectionVec* LCalClusterCol = new LCCollectionVec(LCIO::CLUSTER);
     IMPL::LCFlagImpl lcFlagImpl;
@@ -66,7 +66,7 @@ void MarlinLumiCalClusterer::TryMarlinLumiCalClusterer(EVENT::LCEvent* evt) {
 
     LCCollectionVec* LCalRPCol = new LCCollectionVec(LCIO::RECONSTRUCTEDPARTICLE);
 
-    if (stat) {
+    if (status == RETVAL::OK) {
       streamlog_out(DEBUG6) << " Transfering reco results to LCalClusterCollection....." << std::endl;
 
       for (int armNow = -1; armNow < 2; armNow += 2) {