diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 0323271c19..3aa45f7af7 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -824,7 +824,7 @@
                     "unit": "mm",
                     "type": "float",
                     "default_value": 0.0,
-                    "value": "(machine_nozzle_size - wall_line_width_0) / 2 if wall_line_width_0 < machine_nozzle_size else 0",
+                    "value": "(machine_nozzle_size - wall_line_width_0) / 2 if (wall_line_width_0 < machine_nozzle_size and not outer_inset_first) else 0",
                     "minimum_value_warning": "0",
                     "maximum_value_warning": "machine_nozzle_size",
                     "settable_per_mesh": true