diff --git a/cvat/apps/annotation/coco.py b/cvat/apps/annotation/coco.py
index 616639f9..94769e34 100644
--- a/cvat/apps/annotation/coco.py
+++ b/cvat/apps/annotation/coco.py
@@ -264,7 +264,7 @@ def dump(file_object, annotations):
     insert_info_data(annotations, result_annotation)
     category_map = insert_categories_data(annotations, result_annotation)
 
-    segm_id = 0
+    segm_id = 1
     for img in annotations.group_by_frame():
         polygons = []