diff --git a/botserv.go b/botserv.go
index 55e46f8..5a7d8d2 100644
--- a/botserv.go
+++ b/botserv.go
@@ -122,7 +122,7 @@ type OtherRobot struct {
 }
 
 type Obstacle struct {
-	Bounds govector.Rect2d `json:"bounds"`
+	Bounds govector.AABB2d `json:"bounds"`
 }
 
 type BotHealth struct {