diff --git a/resources/definitions/ultimaker.def.json b/resources/definitions/ultimaker.def.json
index 3dc3555266..279ce92359 100644
--- a/resources/definitions/ultimaker.def.json
+++ b/resources/definitions/ultimaker.def.json
@@ -58,6 +58,12 @@
         },
         "meshfix_maximum_extrusion_area_deviation": {
             "value": "50000"
+        },
+        "top_layers": {
+            "value": "math.ceil(round(top_thickness / resolveOrValue('layer_height'), 4))"
+        },
+        "bottom_layers": {
+            "value": "math.ceil(round(bottom_thickness / resolveOrValue('layer_height'), 4))"
         }
     }
 }