diff --git a/resources/variants/cartesio_0.25.inst.cfg b/resources/variants/cartesio_0.25.inst.cfg
index dd698452d8..f76f429827 100644
--- a/resources/variants/cartesio_0.25.inst.cfg
+++ b/resources/variants/cartesio_0.25.inst.cfg
@@ -11,6 +11,7 @@ type = variant
 machine_nozzle_size = 0.25
 machine_nozzle_tip_outer_diameter = 1.05
 
+wall_thickness = =(wall_line_width_0 + ((wall_line_count - 1) * wall_line_width_x))
 wall_0_inset = -0.05
 fill_perimeter_gaps = nowhere
 travel_compensate_overlapping_walls_enabled =