--- a/net/minecraft/server/RegionLimitedWorldAccess.java
+++ b/net/minecraft/server/RegionLimitedWorldAccess.java
@@ -200,7 +200,14 @@
         this.y(blockposition).e(blockposition);
     }
 
+    // CraftBukkit start
     public boolean addEntity(Entity entity) {
+        return addEntity(entity, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.DEFAULT);
+    }
+
+    @Override
+    public boolean addEntity(Entity entity, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason reason) {
+        // CraftBukkit end
         int i = MathHelper.floor(entity.locX / 16.0D);
         int j = MathHelper.floor(entity.locZ / 16.0D);