diff --git a/protocol.go b/protocol.go
index 593c7cb..0b4681a 100644
--- a/protocol.go
+++ b/protocol.go
@@ -109,7 +109,6 @@ type Boardstate struct {
 	OtherRobots []OtherRobot `json:"robots"`
 	Projectiles []Projectile `json:"projectiles"`
 	Splosions   []Splosion   `json:"splosions"`
-	Obstacles   []Obstacle   `json:"obj"`
 	Objects     [][4]int     `json:"objects"`
 	Type        string       `json:"type"`
 	Turn        int          `json:"turn"`