diff --git a/resources/definitions/ultimaker3.def.json b/resources/definitions/ultimaker3.def.json
index 81cf9efd91..b86e29c2d7 100644
--- a/resources/definitions/ultimaker3.def.json
+++ b/resources/definitions/ultimaker3.def.json
@@ -70,7 +70,7 @@
         "machine_start_gcode": { "default_value": "" },
         "machine_end_gcode": { "default_value": "" },
         "prime_tower_position_x": { "default_value": 175 },
-        "prime_tower_position_y": { "value": "machine_depth - prime_tower_size - (extruderValue(adhesion_extruder_nr, 'brim_width') * extruderValue(adhesion_extruder_nr, 'initial_layer_line_width_factor') if adhesion_type == 'brim' else (extruderValue(adhesion_extruder_nr, 'raft_margin') if adhesion_type == 'raft' else (extruderValue(adhesion_extruder_nr, 'skirt_gap') if adhesion_type == 'skirt' else 0))) - 1" },
+        "prime_tower_position_y": { "value": "machine_depth - prime_tower_size - (extruderValue(adhesion_extruder_nr, 'brim_width') * extruderValue(adhesion_extruder_nr, 'initial_layer_line_width_factor') / 100 if adhesion_type == 'brim' else (extruderValue(adhesion_extruder_nr, 'raft_margin') if adhesion_type == 'raft' else (extruderValue(adhesion_extruder_nr, 'skirt_gap') if adhesion_type == 'skirt' else 0))) - 1" },
         "prime_tower_wipe_enabled": { "default_value": false },
 
         "prime_blob_enable": { "enabled": true },