diff --git a/resources/definitions/prusa_i3.def.json b/resources/definitions/prusa_i3.def.json
index a3759eb6c0..c676f7fe96 100644
--- a/resources/definitions/prusa_i3.def.json
+++ b/resources/definitions/prusa_i3.def.json
@@ -40,6 +40,14 @@
                 [18, -18]
             ]
         },
+        "machine_head_with_fans_polygon": {
+            "default_value": [
+                [-75, -18],
+                [-75, 35],
+                [18, 35],
+                [18, -18]
+            ]
+        },
         "gantry_height": {
             "default_value": 55
         },