diff --git a/src/main/java/org/cyclops/colossalchests/tileentity/TileColossalChest.java b/src/main/java/org/cyclops/colossalchests/tileentity/TileColossalChest.java
index e7e10391..1f7ac1ca 100644
--- a/src/main/java/org/cyclops/colossalchests/tileentity/TileColossalChest.java
+++ b/src/main/java/org/cyclops/colossalchests/tileentity/TileColossalChest.java
@@ -269,7 +269,7 @@ public SPacketUpdateTileEntity getUpdatePacket() {
     }
 
     protected int calculateInventorySize() {
-        return (int) Math.ceil((Math.pow(getSizeSingular(), 3) * 27) * getMaterial().getInventoryMultiplier());
+        return (int) Math.ceil((Math.pow(getSizeSingular(), 3) * 27) * getMaterial().getInventoryMultiplier() / 9) * 9;
     }
 
     @Override