diff --git a/resources/machines/fdmprinter.json b/resources/machines/fdmprinter.json
index b74fe4f03c..f83b1e6807 100644
--- a/resources/machines/fdmprinter.json
+++ b/resources/machines/fdmprinter.json
@@ -1008,7 +1008,7 @@
                     "unit": "mm",
                     "type": "float",
                     "default": 1.5,
-                    "inherit_function": "machine_nozzle_tip_outer_diameter * 1.25",
+                    "inherit_function": "machine_nozzle_tip_outer_diameter / 2 * 1.25",
                     "min_value": "0",
                     "max_value_warning": "machine_nozzle_tip_outer_diameter * 5",
                     "visible": false,