diff --git a/resources/definitions/ultimaker.def.json b/resources/definitions/ultimaker.def.json
index cf257d0ea6..a1be0e9dfe 100644
--- a/resources/definitions/ultimaker.def.json
+++ b/resources/definitions/ultimaker.def.json
@@ -120,7 +120,7 @@
         "support_interface_skip_height": { "value": "layer_height" },
         "support_line_distance": { "minimum_value_warning": "0 if support_structure == 'tree' else support_line_width" },
         "support_offset": { "value": "0.9 if support_interface_enable else 0" },
-        "support_tower_roof_angle": { "value": "65 if support_interface_enable else 0" },
+        "support_tower_roof_angle": { "value": "0 if support_interface_enable else 65" },
         "support_wall_count": { "value": "1 if support_structure == 'tree' else 0" },
         "support_xy_distance": { "value": "1" },
         "support_xy_distance_overhang": { "value": "0.2" },