diff --git a/resources/TConstruct_at.cfg b/resources/TConstruct_at.cfg
index f58d04a6b2d..467fa4bbd4a 100644
--- a/resources/TConstruct_at.cfg
+++ b/resources/TConstruct_at.cfg
@@ -22,6 +22,7 @@ public net.minecraft.block.BlockRailBase$Rail func_150650_a()I
 # GuiContainer
 public net.minecraft.client.gui.inventory.GuiContainer field_146999_f 
 public net.minecraft.client.gui.inventory.GuiContainer field_147009_r 
+public net.minecraft.client.gui.inventory.GuiContainer field_147003_i 
 # GuiScreen
 public net.minecraft.client.gui.GuiScreen field_146292_n #buttonList
 # ThreadDownloadImageData
@@ -30,4 +31,4 @@ public net.minecraft.client.renderer.ThreadDownloadImageData field_110560_d #fie
 public net.minecraft.world.gen.structure.StructureVillagePieces$Village #cant make village houses w/o this
 public net.minecraft.client.renderer.Tessellator field_78415_z
 public net.minecraft.client.renderer.entity.RenderPlayer field_77109_a #modelBipedMain
-# needs to have a space at the end of every line or SS will derp
\ No newline at end of file
+# needs to have a space at the end of every line or SS will derp
diff --git a/src/main/java/tconstruct/client/gui/ArmorExtendedGui.java b/src/main/java/tconstruct/client/gui/ArmorExtendedGui.java
index 063f11d374a..d7a73c721dc 100644
--- a/src/main/java/tconstruct/client/gui/ArmorExtendedGui.java
+++ b/src/main/java/tconstruct/client/gui/ArmorExtendedGui.java
@@ -48,7 +48,7 @@ public void initGui ()
         // tab.enabled = false;
         // this.buttonList.add(tab);
 
-        TabRegistry.updateTabValues(cornerX + 51, cornerY, InventoryTabArmorExtended.class);
+        TabRegistry.updateTabValues(cornerX, cornerY, InventoryTabArmorExtended.class);
         TabRegistry.addTabsToList(this.buttonList);
     }
 
diff --git a/src/main/java/tconstruct/client/gui/KnapsackGui.java b/src/main/java/tconstruct/client/gui/KnapsackGui.java
index 1a549c70ced..93e112f2240 100644
--- a/src/main/java/tconstruct/client/gui/KnapsackGui.java
+++ b/src/main/java/tconstruct/client/gui/KnapsackGui.java
@@ -1,6 +1,7 @@
 package tconstruct.client.gui;
 
 import net.minecraft.client.gui.inventory.GuiContainer;
+import net.minecraft.client.renderer.InventoryEffectRenderer;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.util.ResourceLocation;
 import net.minecraft.util.StatCollector;
@@ -12,7 +13,7 @@
 import tconstruct.inventory.KnapsackContainer;
 import tconstruct.util.player.KnapsackInventory;
 
-public class KnapsackGui extends GuiContainer
+public class KnapsackGui extends InventoryEffectRenderer
 {
     public InventoryPlayer inv;
     public KnapsackInventory stats;
@@ -33,7 +34,7 @@ public void initGui ()
         int cornerY = guiTop;
         this.buttonList.clear();
 
-        TabRegistry.updateTabValues(cornerX + 51, cornerY, InventoryTabKnapsack.class);
+        TabRegistry.updateTabValues(cornerX, cornerY, InventoryTabKnapsack.class);
         TabRegistry.addTabsToList(this.buttonList);
 
         // InventoryTab tab = new InventoryTab(2, cornerX, cornerY - 28, new
diff --git a/src/main/java/tconstruct/client/tabs/TabRegistry.java b/src/main/java/tconstruct/client/tabs/TabRegistry.java
index f49775d7cdf..f305f040d8c 100644
--- a/src/main/java/tconstruct/client/tabs/TabRegistry.java
+++ b/src/main/java/tconstruct/client/tabs/TabRegistry.java
@@ -27,7 +27,7 @@ public static void addTabsToInventory (GuiContainer gui)
         if (gui.getClass() == GuiInventory.class)
         {
             // Values are public at runtime.
-            int cornerX = gui.xSize;
+            int cornerX = gui.guiLeft;
             int cornerY = gui.guiTop;
             gui.buttonList.clear();