--- a/net/minecraft/server/WorldGenFactory.java
+++ b/net/minecraft/server/WorldGenFactory.java
@@ -9,7 +9,7 @@
 public class WorldGenFactory {
 
     private static final Logger a = LogManager.getLogger();
-    private static final Map<String, Class<? extends StructureStart>> b = Maps.newHashMap();
+    public static final Map<String, Class<? extends StructureStart>> b = Maps.newHashMap(); // CraftBukkit private -> public
     private static final Map<Class<? extends StructureStart>, String> c = Maps.newHashMap();
     private static final Map<String, Class<? extends StructurePiece>> d = Maps.newHashMap();
     private static final Map<Class<? extends StructurePiece>, String> e = Maps.newHashMap();