diff --git a/darwin/exporter/formats/darwin_1_0.py b/darwin/exporter/formats/darwin_1_0.py
index 538c2a975..28744817d 100644
--- a/darwin/exporter/formats/darwin_1_0.py
+++ b/darwin/exporter/formats/darwin_1_0.py
@@ -176,7 +176,7 @@ def _build_legacy_annotation_data(annotation_class: AnnotationClass, data: DictF
         v1_data["tag"] = {}
 
     elif annotation_class.annotation_type == "bounding_box":
-        v1_data["bounding_box"] = data
+        v1_data[annotation_class.annotation_type] = data
 
     if "bounding_box" in data and annotation_class.annotation_type != "bounding_box":
         # Poygons and complex polygons usually have attached bounding_box annotations