diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
index c5482b474..bf6ee95a6 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
@@ -53,7 +53,7 @@ open class MatterySlot(container: Container, index: Int, x: Int = 0, y: Int = 0)
 
 	override fun setChanged() {
 		if (container is IMatteryContainer) {
-			(container as IMatteryContainer).setChanged(index)
+			(container as IMatteryContainer).setChanged(containerSlot)
 		} else {
 			super.setChanged()
 		}