diff --git a/code/open_spacecharge_mod.f90 b/code/open_spacecharge_mod.f90
index 6f8e32d..798f413 100644
--- a/code/open_spacecharge_mod.f90
+++ b/code/open_spacecharge_mod.f90
@@ -178,6 +178,11 @@ subroutine deposit_particles(xa, ya, za, mesh3d, qa, total_charge, resize_mesh)
   max = [maxval(xa), maxval(ya), maxval(za)] 
   delta =(max(:) - min(:) ) / (mesh3d%nhi(:) - mesh3d%nlo(:) )
   
+  ! Small padding to protect against indexing errors
+  min = min - 1.0e-6_dp*delta
+  max = max + 1.0e-6_dp*delta
+  delta =(max(:) - min(:) ) / (mesh3d%nhi(:) - mesh3d%nlo(:) )
+  
   mesh3d%min = min
   mesh3d%max = max
   mesh3d%delta = delta
@@ -234,6 +239,8 @@ subroutine deposit_particles(xa, ya, za, mesh3d, qa, total_charge, resize_mesh)
 
 n_particles = size(xa)
 
+
+
 if (present(qa)) then
     mesh3d%charge = sum(qa)
 elseif (present(total_charge) .and. .not. present(qa)) then