diff --git a/resources/definitions/vertex_delta_k8800.def.json b/resources/definitions/vertex_delta_k8800.def.json
index dff1c52d0d..e62f61e29f 100644
--- a/resources/definitions/vertex_delta_k8800.def.json
+++ b/resources/definitions/vertex_delta_k8800.def.json
@@ -43,7 +43,7 @@
     "gantry_height": {
       "default_value": 0
     },
-	"material_diameter": {
+    "material_diameter": {
       "default_value": 1.75
     },
     "machine_nozzle_offset_x_1": {