diff --git a/scenes/interface.gd b/scenes/interface.gd
index 8e4b4f9..40ded95 100644
--- a/scenes/interface.gd
+++ b/scenes/interface.gd
@@ -24,7 +24,10 @@ func _process(delta: float) -> void:
 	pass
 
 func set_life(pv : int) -> void :
-	for i in range(life, pv):
+	var step = 1
+	if pv > life :
+		step = -1
+	for i in range(life, pv, step):
 		update_life(i)
 	update_life(pv)