--- a/net/minecraft/world/item/alchemy/PotionContents.java
+++ b/net/minecraft/world/item/alchemy/PotionContents.java
@@ -93,7 +93,7 @@
     }
 
     public PotionContents withEffectAdded(MobEffect mobeffect) {
-        return new PotionContents(this.potion, this.customColor, SystemUtils.copyAndAdd(this.customEffects, (Object) mobeffect), this.customName);
+        return new PotionContents(this.potion, this.customColor, SystemUtils.copyAndAdd(this.customEffects, mobeffect), this.customName); // CraftBukkit - decompile error
     }
 
     public int getColor() {
@@ -172,7 +172,7 @@
                 if (((MobEffectList) mobeffect.getEffect().value()).isInstantenous()) {
                     ((MobEffectList) mobeffect.getEffect().value()).applyInstantenousEffect(worldserver, entityhuman2, entityhuman2, entityliving, mobeffect.getAmplifier(), 1.0D);
                 } else {
-                    entityliving.addEffect(mobeffect);
+                    entityliving.addEffect(mobeffect, org.bukkit.event.entity.EntityPotionEffectEvent.Cause.POTION_DRINK); // CraftBukkit
                 }
 
             });
