diff --git a/resources/definitions/malyan_m200.def.json b/resources/definitions/malyan_m200.def.json
index 9aae3a5244..365b031c43 100644
--- a/resources/definitions/malyan_m200.def.json
+++ b/resources/definitions/malyan_m200.def.json
@@ -51,7 +51,7 @@
         "machine_height": { "default_value": 120 },
         "machine_heated_bed": { "default_value": true },
         "machine_center_is_zero": { "default_value": false },
-        "material_diameter": { "value": 1.75 },
+        "material_diameter": { "default_value": 1.75 },
         "machine_nozzle_size": {
             "default_value": 0.4,
             "minimum_value": 0.15