--- ../work/decompile-bb26c12b/net/minecraft/server/EntitySpider.java	2014-11-27 08:59:46.733421706 +1100
+++ src/main/java/net/minecraft/server/EntitySpider.java	2014-11-27 08:42:10.096851020 +1100
@@ -107,7 +107,7 @@
 
             entityskeleton.setPositionRotation(this.locX, this.locY, this.locZ, this.yaw, 0.0F);
             entityskeleton.prepare(difficultydamagescaler, (GroupDataEntity) null);
-            this.world.addEntity(entityskeleton);
+            this.world.addEntity(entityskeleton, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.JOCKEY); // CraftBukkit - add SpawnReason
             entityskeleton.mount(this);
         }