diff --git a/src/me/mrCookieSlime/Slimefun/Variables.java b/src/me/mrCookieSlime/Slimefun/Variables.java
index 2d5ef8306..d47a44372 100644
--- a/src/me/mrCookieSlime/Slimefun/Variables.java
+++ b/src/me/mrCookieSlime/Slimefun/Variables.java
@@ -2,10 +2,12 @@ package me.mrCookieSlime.Slimefun;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
 
+import org.bukkit.Location;
 import org.bukkit.entity.Entity;
 import org.bukkit.inventory.ItemStack;
 
@@ -18,6 +20,7 @@ public class Variables {
 	
 	public static Map<UUID, Integer> enchanting = new HashMap<UUID, Integer>();
 	public static Map<UUID, ItemStack> backpack = new HashMap<UUID, ItemStack>();
+	public static HashSet<Location> altarinuse = new HashSet<Location>();
 	
 	public static Map<UUID, List<ItemStack>> soulbound = new HashMap<UUID, List<ItemStack>>();
 	public static List<UUID> blocks = new ArrayList<UUID>();