diff --git a/Src/Particle/AMReX_NeighborList.H b/Src/Particle/AMReX_NeighborList.H
index 330bef29834..a94c351fa6c 100644
--- a/Src/Particle/AMReX_NeighborList.H
+++ b/Src/Particle/AMReX_NeighborList.H
@@ -310,8 +310,8 @@ public:
         m_pstruct = aos().dataPtr();
         auto* const pstruct_ptr = aos().dataPtr();
 
-        const size_t np_total = aos.size();
-        const size_t np_real  = src_tile.numRealParticles();
+        const int np_total = aos.size();
+        const int np_real  = src_tile.numRealParticles();
 
         auto const* off_bins_p = off_bins_v.data();
         auto const* dxi_p      = dxi_v.data();
@@ -333,7 +333,7 @@ public:
 
         // First pass: count the number of neighbors for each particle
         //---------------------------------------------------------------------------------------------------------
-        const size_t np_size  = (num_bin_types > 1) ? np_total : np_real;
+        const int np_size  = (num_bin_types > 1) ? np_total : np_real;
         m_nbor_counts.resize( np_size+1, 0);
         m_nbor_offsets.resize(np_size+1);
 
diff --git a/Src/Particle/AMReX_NeighborParticlesI.H b/Src/Particle/AMReX_NeighborParticlesI.H
index ec4fe63c644..0b09923b0b0 100644
--- a/Src/Particle/AMReX_NeighborParticlesI.H
+++ b/Src/Particle/AMReX_NeighborParticlesI.H
@@ -1065,7 +1065,7 @@ selectActualNeighbors (CheckPair&& check_pair, int num_cells)
                             if (isActualNeighbor) { break; }
                             int nbr_cell_id = (ii * ny + jj) * nz + kk;
                             for (auto p = poffset[nbr_cell_id]; p < poffset[nbr_cell_id+1]; ++p) {
-                                if (pperm[p] == i) { continue; }
+                                if (pperm[p] == int(i)) { continue; }
                                 if (call_check_pair(check_pair, ptile_data, ptile_data, i, pperm[p])) {
                                     IntVect cell_ijk = getParticleCell(pstruct[pperm[p]], plo, dxi, domain);
                                     if (!box.contains(cell_ijk)) {