--- a/net/minecraft/server/EntityGuardianElder.java
+++ b/net/minecraft/server/EntityGuardianElder.java
@@ -68,7 +68,7 @@
 
                 if (!entityplayer.hasEffect(mobeffectlist) || entityplayer.getEffect(mobeffectlist).getAmplifier() < 2 || entityplayer.getEffect(mobeffectlist).getDuration() < 1200) {
                     entityplayer.playerConnection.sendPacket(new PacketPlayOutGameStateChange(10, 0.0F));
-                    entityplayer.addEffect(new MobEffect(mobeffectlist, 6000, 2));
+                    entityplayer.addEffect(new MobEffect(mobeffectlist, 6000, 2), org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ATTACK); // CraftBukkit
                 }
             }
         }