diff --git a/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUI.java b/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUI.java
index ba8f224..d7c2230 100644
--- a/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUI.java
+++ b/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUI.java
@@ -4,6 +4,12 @@ import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.InventoryHolder;
 
 public class GUI implements InventoryHolder {
+    public static final int MAX_INVENTORY_SIZE = 54; // max size of inventory before pages are needed
+    public static final int MAX_PAGE_INVENTORY_SIZE = 45; // max amount of items on a page
+
+    private Inventory inventory;
+    private int currentPage;
+
 
     @Override
     public Inventory getInventory() {
diff --git a/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUIBuilder.java b/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUIBuilder.java
index 63f59e6..2ee2d7a 100644
--- a/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUIBuilder.java
+++ b/ic_plugin_core/src/main/java/nl/interestingcorner/core/gui/GUIBuilder.java
@@ -8,8 +8,6 @@ import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.inventory.ItemStack;
 
 public class GUIBuilder {
-    public static final int MAX_INVENTORY_SIZE = 54; // max size of inventory before pages are needed
-    public static final int MAX_PAGE_INVENTORY_SIZE = 45; // max amount of items on a page
 
     public Inventory buildInventory(List<ItemStack> items) {
         /**