diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index e76d277b0c..bbf4df56d8 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -3297,6 +3297,7 @@
                     "default_value": 15,
                     "value": "15 if prime_tower_enable else 0",
                     "minimum_value": "0",
+                    "maximum_value": "min(0.5 * machine_width, 0.5 * machine_depth)",
                     "maximum_value_warning": "20",
                     "settable_per_mesh": false,
                     "settable_per_extruder": false