--- a/net/minecraft/server/EntitySpectralArrow.java
+++ b/net/minecraft/server/EntitySpectralArrow.java
@@ -32,7 +32,7 @@
         super.a(entityliving);
         MobEffect mobeffect = new MobEffect(MobEffects.GLOWING, this.duration, 0);
 
-        entityliving.addEffect(mobeffect);
+        entityliving.addEffect(mobeffect, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.ARROW); // CraftBukkit
     }
 
     public void a(NBTTagCompound nbttagcompound) {