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 640b6156a..c5482b474 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/menu/Slots.kt
@@ -51,6 +51,14 @@ inline fun <S : Slot> makeSlots(containers: List<Container>?, size: Int, initial
 open class MatterySlot(container: Container, index: Int, x: Int = 0, y: Int = 0) : Slot(container, index, x, y) {
 	var ignoreSpectators = true
 
+	override fun setChanged() {
+		if (container is IMatteryContainer) {
+			(container as IMatteryContainer).setChanged(index)
+		} else {
+			super.setChanged()
+		}
+	}
+
 	override fun mayPickup(player: Player): Boolean {
 		return super.mayPickup(player) && (!ignoreSpectators || !player.isSpectator)
 	}