diff --git a/resources/definitions/ultimaker_s8.def.json b/resources/definitions/ultimaker_s8.def.json
index dfaff3f0f2..1fc8c05628 100644
--- a/resources/definitions/ultimaker_s8.def.json
+++ b/resources/definitions/ultimaker_s8.def.json
@@ -430,6 +430,7 @@
         "material_print_temperature": { "maximum_value_warning": 320 },
         "material_print_temperature_layer_0": { "maximum_value_warning": 320 },
         "max_flow_acceleration": { "value": 1.5 },
+        "max_skin_angle_for_expansion": { "value": 45 },
         "meshfix_maximum_resolution": { "value": 0.4 },
         "min_infill_area": { "default_value": 10 },
         "optimize_wall_printing_order": { "value": false },
@@ -445,7 +446,7 @@
         "retraction_hop_after_extruder_switch_height": { "value": 2 },
         "retraction_hop_enabled": { "value": true },
         "retraction_min_travel": { "value": "2.5 if support_enable and support_structure=='tree' else line_width * 2.5" },
-        "roofing_extension": { "value": "max(wall_line_width_0 * min(1, wall_line_count) + wall_line_width_x * max(0, wall_line_count - 1) + wall_line_width * 2, 2)" },
+        "roofing_extension": { "value": 1.2 },
         "roofing_pattern": { "value": "'lines'" },
         "seam_overhang_angle": { "value": 35 },
         "skin_edge_support_thickness": { "value": 0.8 },