diff --git a/libs/labelbox/src/labelbox/data/annotation_types/geometry/rectangle.py b/libs/labelbox/src/labelbox/data/annotation_types/geometry/rectangle.py
index 5cabf0957..af37734b0 100644
--- a/libs/labelbox/src/labelbox/data/annotation_types/geometry/rectangle.py
+++ b/libs/labelbox/src/labelbox/data/annotation_types/geometry/rectangle.py
@@ -94,6 +94,7 @@ class RectangleUnit(Enum):
     INCHES = "INCHES"
     PIXELS = "PIXELS"
     POINTS = "POINTS"
+    PERCENT = "PERCENT"
 
 
 class DocumentRectangle(Rectangle):