diff --git a/resources/definitions/alya3dp.def.json b/resources/definitions/alya3dp.def.json
index 68da72f1eb..8d1eb6730c 100644
--- a/resources/definitions/alya3dp.def.json
+++ b/resources/definitions/alya3dp.def.json
@@ -27,17 +27,13 @@
         "machine_nozzle_size": {
             "default_value": 0.4
         },
-        "machine_head_shape_min_x": {
-            "default_value": 75
-        },
-        "machine_head_shape_min_y": {
-            "default_value": 18
-        },
-        "machine_head_shape_max_x": {
-            "default_value": 18
-        },
-        "machine_head_shape_max_y": {
-            "default_value": 35
+        "machine_head_polygon": {
+            "default_value": [
+                [75, 18],
+                [18, 18],
+                [18, 35],
+                [75, 35]
+            ]
         },
         "gantry_height": {
             "default_value": 55