diff --git a/resources/definitions/ultimaker3.def.json b/resources/definitions/ultimaker3.def.json
index ad8b08dfa1..e17316a80b 100644
--- a/resources/definitions/ultimaker3.def.json
+++ b/resources/definitions/ultimaker3.def.json
@@ -103,7 +103,7 @@
         "layer_height_0": { "value": "round(machine_nozzle_size / 1.5, 2)" },
         "layer_start_x": { "value": "sum(extruderValues('machine_extruder_start_pos_x')) / len(extruderValues('machine_extruder_start_pos_x'))" },
         "layer_start_y": { "value": "sum(extruderValues('machine_extruder_start_pos_y')) / len(extruderValues('machine_extruder_start_pos_y'))" },
-        "line_width": { "value": "machine_nozzle_size * 0.875" },
+        "line_width": { "value": "round(machine_nozzle_size * 0.875, 3)" },
         "machine_min_cool_heat_time_window": { "value": "15" },
         "default_material_print_temperature": { "value": "200" },
         "material_print_temperature_layer_0": { "value": "material_print_temperature + 5" },