diff --git a/gprMax/cmds_geometry/edge.py b/gprMax/cmds_geometry/edge.py
index 52c3b19b..70920e60 100644
--- a/gprMax/cmds_geometry/edge.py
+++ b/gprMax/cmds_geometry/edge.py
@@ -68,14 +68,14 @@ class Edge(UserObjectGeometry):
 
         if self.dorotate:
             self.__dorotate()
-
+        
+        p3 = uip.round_to_grid_static_point(p1)
+        p4 = uip.round_to_grid_static_point(p2)
+        
         p1, p2 = uip.check_box_points(p1, p2, self.__str__())
         xs, ys, zs = p1
         xf, yf, zf = p2
 
-        p3 = uip.round_to_grid_static_point(p1)
-        p4 = uip.round_to_grid_static_point(p2)
-
         material = next((x for x in grid.materials if x.ID == material_id), None)
 
         if not material: