--- a/net/minecraft/server/MobEffects.java
+++ b/net/minecraft/server/MobEffects.java
@@ -57,6 +57,14 @@
     });
     public static final MobEffectList HERO_OF_THE_VILLAGE = a(32, "hero_of_the_village", new MobEffectList(MobEffectInfo.BENEFICIAL, 4521796));
 
+    // CraftBukkit start
+    static {
+        for (Object effect : IRegistry.MOB_EFFECT) {
+            org.bukkit.potion.PotionEffectType.registerPotionEffectType(new org.bukkit.craftbukkit.potion.CraftPotionEffectType((MobEffectList) effect));
+        }
+    }
+    // CraftBukkit end
+
     private static MobEffectList a(int i, String s, MobEffectList mobeffectlist) {
         return (MobEffectList) IRegistry.a(IRegistry.MOB_EFFECT, i, s, mobeffectlist);
     }
