diff --git a/src/particlesTransport.f90 b/src/particlesTransport.f90
index 7105231da401a1ea8541deedea49b9de2d35824d..ea3fbd0e16643e4ef936eedf38c58f9d53a00f76 100644
--- a/src/particlesTransport.f90
+++ b/src/particlesTransport.f90
@@ -357,7 +357,7 @@
                        r3n1,r3n2,rxx,projvtox,srel,projvton, &
                        closestrelvelo,fracdt, &
                        vex,vey,vez,vnx,vny,vnz
-      integer :: n1,n2,numcol,ip,jp,lp,m1,m2,i,j,l
+      integer :: n1,n2,numcol,ip,jp,lp,m1,m2,i,j,l,syncSumI
       
 
       numcol=0
@@ -482,6 +482,7 @@
 1     enddo
 3     enddo
 
+      numcol=syncSumI(numcol)
       if (myid.eq.0) write(*,'(a,i9)',advance='no') &
         ' |collide =',numcol