--- ../src-base/minecraft/net/minecraft/world/gen/structure/MapGenStructure.java
+++ ../src-work/minecraft/net/minecraft/world/gen/structure/MapGenStructure.java
@@ -231,12 +231,12 @@
     {
         if (this.field_143029_e == null)
         {
-            this.field_143029_e = (MapGenStructureData)p_143027_1_.func_72943_a(MapGenStructureData.class, this.func_143025_a());
+            this.field_143029_e = (MapGenStructureData)p_143027_1_.getPerWorldStorage().func_75742_a(MapGenStructureData.class, this.func_143025_a());
 
             if (this.field_143029_e == null)
             {
                 this.field_143029_e = new MapGenStructureData(this.func_143025_a());
-                p_143027_1_.func_72823_a(this.func_143025_a(), this.field_143029_e);
+                p_143027_1_.getPerWorldStorage().func_75745_a(this.func_143025_a(), this.field_143029_e);
             }
             else
             {
