diff --git a/Src/Arranger/FOctreeArranger.hpp b/Src/Arranger/FOctreeArranger.hpp
index f3e3bb3e025c817652fc9f151ada66c8ec811934..b84833875571c2da5a47d14fea46039aa12328f4 100755
--- a/Src/Arranger/FOctreeArranger.hpp
+++ b/Src/Arranger/FOctreeArranger.hpp
@@ -64,10 +64,11 @@ public:
             do{
                 const MortonIndex currentIndex = octreeIterator.getCurrentGlobalIndex();
                 ContainerClass* particles = octreeIterator.getCurrentLeaf()->getSrc();
-                for(int idxPart = 0 ; idxPart < particles->getNbParticles(); ++idxPart){
+                //IdxPart is incremented at the end of the loop
+                for(int idxPart = 0 ; idxPart < particles->getNbParticles(); /*++idxPart*/){
                     FPoint partPos( particles->getPositions()[0][idxPart],
-                            particles->getPositions()[1][idxPart],
-                            particles->getPositions()[2][idxPart] );
+                                    particles->getPositions()[1][idxPart],
+                                    particles->getPositions()[2][idxPart] );
                     // XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
                     if( TestPeriodicCondition(isPeriodic, DirPlusX) ){
                         while(partPos.getX() >= max.getX()){
@@ -133,6 +134,10 @@ public:
                     const MortonIndex particuleIndex = tree->getMortonFromPosition(partPos);
                     if(particuleIndex != currentIndex){
                         tomove.push(ConverterClass::GetParticleAndRemove(particles,idxPart));
+                        //No need to increment idxPart, since the array has been staggered
+                    }
+                    else{
+                        idxPart++;
                     }
                 }
             } while(octreeIterator.moveRight());
diff --git a/Src/Arranger/FOctreeArrangerProc.hpp b/Src/Arranger/FOctreeArrangerProc.hpp
index 224728cae9bdb737a70345e85cfe8374cbdd929b..499bdb3c6c70d76d42a1929e9fef6605d5f5c677 100755
--- a/Src/Arranger/FOctreeArrangerProc.hpp
+++ b/Src/Arranger/FOctreeArrangerProc.hpp
@@ -4,13 +4,13 @@
 // This software is a computer program whose purpose is to compute the FMM.
 //
 // This software is governed by the CeCILL-C and LGPL licenses and
-// abiding by the rules of distribution of free software.  
-// 
+// abiding by the rules of distribution of free software.
+//
 // This program 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 and CeCILL-C Licenses for more details.
-// "http://www.cecill.info". 
+// "http://www.cecill.info".
 // "http://www.gnu.org/licenses".
 // ===================================================================================
 #ifndef FOCTREEARRANGERPROC_HPP
@@ -114,7 +114,8 @@ public:
             do{
                 const MortonIndex currentIndex = octreeIterator.getCurrentGlobalIndex();
                 ContainerClass* particles = octreeIterator.getCurrentLeaf()->getSrc();
-                for(int idxPart = 0 ; idxPart < particles->getNbParticles(); ++idxPart){
+                //IdxPart is incremented at the end of the loop
+                for(int idxPart = 0 ; idxPart < particles->getNbParticles(); /*++idxPart*/){
                     FPoint partPos( particles->getPositions()[0][idxPart],
                             particles->getPositions()[1][idxPart],
                             particles->getPositions()[2][idxPart] );
@@ -187,6 +188,10 @@ public:
                         const int procConcerned = getInterval( particuleIndex, comm.processCount(), intervals);
                         toMove[procConcerned].push(ConverterClass::GetParticleAndRemove(particles,idxPart));
                         indexesToExtract.push(idxPart);
+                        //No need to increment idxPart, since the array has been staggered
+                    }
+                    else{
+                        idxPart++;
                     }
                 }
 
@@ -271,7 +276,7 @@ public:
                     }
                     hasToRecvFrom -= 1;
                 }
-            }            
+            }
         }
 
         int counterLeavesAlive = 0;
@@ -290,7 +295,7 @@ public:
                 // Not empty, just continue
                 else {
                     workOnNext = octreeIterator.moveRight();
-                    counterLeavesAlive += 1;                    
+                    counterLeavesAlive += 1;
                 }
             } while( workOnNext );
         }