--- a/net/minecraft/entity/EntityClassification.java
+++ b/net/minecraft/entity/EntityClassification.java
@@ -6,7 +6,7 @@
 import java.util.stream.Collectors;
 import net.minecraft.util.IStringSerializable;
 
-public enum EntityClassification implements IStringSerializable {
+public enum EntityClassification implements IStringSerializable, net.minecraftforge.common.IExtensibleEnum {
    MONSTER("monster", 70, false, false, 128),
    CREATURE("creature", 10, true, true, 128),
    AMBIENT("ambient", 15, true, false, 128),
@@ -57,6 +57,10 @@
       return this.field_82707_i;
    }
 
+   public static EntityClassification create(String name, String id, int maxNumberOfCreatureIn, boolean isPeacefulCreatureIn, boolean isAnimalIn, int despawnDistance) {
+      throw new IllegalStateException("Enum not extended");
+   }
+
    public int func_233671_f_() {
       return this.field_233669_n_;
    }
