diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 566e32b349..af4adadcae 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -4490,13 +4490,11 @@
                     "type": "extruder",
                     "default_value": "0",
                     "enabled": "(support_enable or support_meshes_present) and extruders_enabled_count > 1",
-                    "value": "int(anyExtruderNrWithOrDefault('material_is_support_material'))",
+                    "value": "int(defaultExtruderPosition())",
                     "settable_per_mesh": false,
                     "settable_per_extruder": false,
-                    "children":
-                    {
-                        "support_infill_extruder_nr":
-                        {
+                    "children": {
+                        "support_infill_extruder_nr": {
                             "label": "Support Infill Extruder",
                             "description": "The extruder train to use for printing the infill of the support. This is used in multi-extrusion.",
                             "type": "extruder",