diff --git a/ball.gd b/ball.gd
index b55b7c9..934b492 100644
--- a/ball.gd
+++ b/ball.gd
@@ -5,15 +5,15 @@ const SPEED : float = 300.0
 func _ready() -> void:
   initialize()
 
-  func _physics_process(delta: float) -> void:
-    var collision = move_and_collide(velocity * _delta)
-    if collision:
-      velocity = velocity.bounce(collision.get_normal())
+func _physics_process(_delta: float) -> void:
+  var collision = move_and_collide(velocity * _delta)
+  if collision:
+    velocity = velocity.bounce(collision.get_normal())
 
 func initialize():
   var extra_offset = 0.0 if randf() < 0.5 else PI
   var angle = extra_offset + randf_range(-PI/3.0, PI/3.0)
-    velocity = Vector2(cos(angle), sin(angle)).normalized() * SPEED
+  velocity = Vector2(cos(angle), sin(angle)).normalized() * SPEED
   position = get_viewport_rect().size / 2.0
 
 func _on_screen_exited() -> void: