diff --git a/src/REPLICA/prd.cpp b/src/REPLICA/prd.cpp
index 4597d974b8..fd2df15fa5 100644
--- a/src/REPLICA/prd.cpp
+++ b/src/REPLICA/prd.cpp
@@ -482,7 +482,7 @@ void PRD::dynamics()
   update->integrate->setup();
   // this may be needed if don't do full init
   //modify->addstep_compute_all(update->ntimestep);
-  int ncalls = neighbor->ncalls;
+  bigint ncalls = neighbor->ncalls;
 
   timer->barrier_start(TIME_LOOP);
   update->integrate->run(t_event);
diff --git a/src/REPLICA/prd.h b/src/REPLICA/prd.h
index 45192480b3..7a23aa2068 100644
--- a/src/REPLICA/prd.h
+++ b/src/REPLICA/prd.h
@@ -39,8 +39,8 @@ class PRD : protected Pointers {
 
   int equal_size_replicas,natoms;
   int neigh_every,neigh_delay,neigh_dist_check;
-  int nbuild,ndanger;
   int quench_reneighbor;
+  bigint nbuild,ndanger;
 
   double time_dephase,time_dynamics,time_quench,time_comm,time_output;
   double time_start;
diff --git a/src/REPLICA/tad.h b/src/REPLICA/tad.h
index 8b370f1e94..3d7b98eaaf 100644
--- a/src/REPLICA/tad.h
+++ b/src/REPLICA/tad.h
@@ -42,8 +42,8 @@ class TAD : protected Pointers {
   int event_first;
 
   int neigh_every,neigh_delay,neigh_dist_check;
-  int nbuild,ndanger;
   int quench_reneighbor;
+  bigint nbuild,ndanger;
 
   double time_dynamics,time_quench,time_neb,time_comm,time_output;
   double time_start;