diff --git a/src/mode_create.f90 b/src/mode_create.f90
index 0b026c2..db6fdd0 100644
--- a/src/mode_create.f90
+++ b/src/mode_create.f90
@@ -105,8 +105,8 @@ module mode_create
                 end do
             end do
             do i = 1,3
-                box_bd(2*i) = maxval(r_node_temp(i,:,:))
-                box_bd(2*i-1) = origin(i)
+                box_bd(2*i) = maxval(r_node_temp(i,:,:))+10.0_dp**-6.0_dp
+                box_bd(2*i-1) = minval(r_node_temp(i,:,:)) - 10.0_dp**-6.0_dp
             end do
             call add_element(element_type, esize, 1, 1, r_node_temp)
         end if