--- ../src-base/minecraft/net/minecraft/tileentity/TileEntityEndPortal.java
+++ ../src-work/minecraft/net/minecraft/tileentity/TileEntityEndPortal.java
@@ -3,4 +3,12 @@
 public class TileEntityEndPortal extends TileEntity
 {
     private static final String __OBFID = "CL_00000365";
+
+    // Cauldron start
+    @Override
+    public boolean canUpdate()
+    {
+        return false;
+    }
+    // Cauldron end
 }