diff --git a/resources/definitions/inat_proton_x_rail.def.json b/resources/definitions/inat_proton_x_rail.def.json
index 70badb7350..ffaca10bdf 100644
--- a/resources/definitions/inat_proton_x_rail.def.json
+++ b/resources/definitions/inat_proton_x_rail.def.json
@@ -13,7 +13,7 @@
         "machine_name": { "default_value": "Proton X Rail" },
         "machine_width": { "default_value": 304 },
         "machine_depth": { "default_value": 304 },
-        "machine_height": { "default_value": 675 },
+        "machine_height": { "default_value": 300 },
         "machine_max_acceleration_x": {
             "value": 500
         },
diff --git a/resources/definitions/inat_proton_x_rod.def.json b/resources/definitions/inat_proton_x_rod.def.json
index 93f9371e97..1c3592bbd3 100644
--- a/resources/definitions/inat_proton_x_rod.def.json
+++ b/resources/definitions/inat_proton_x_rod.def.json
@@ -13,6 +13,6 @@
         "machine_name": { "default_value": "Proton X Rod" },
         "machine_width": { "default_value": 304 },
         "machine_depth": { "default_value": 304 },
-        "machine_height": { "default_value": 675 }
+        "machine_height": { "default_value": 300 }
     }
 }
\ No newline at end of file