diff --git a/src/main/java/cn/nukkit/potion/Effect.java b/src/main/java/cn/nukkit/potion/Effect.java
index ba3c3391cac..5934d2f84d4 100644
--- a/src/main/java/cn/nukkit/potion/Effect.java
+++ b/src/main/java/cn/nukkit/potion/Effect.java
@@ -179,6 +179,7 @@ public boolean canTick() {
         int interval;
         switch (this.id) {
             case Effect.POISON: //POISON
+            case Effect.FATAL_POISON:
                 if ((interval = (25 >> this.amplifier)) > 0) {
                     return (this.duration % interval) == 0;
                 }
@@ -200,7 +201,8 @@ public boolean canTick() {
     public void applyEffect(Entity entity) {
         switch (this.id) {
             case Effect.POISON: //POISON
-                if (entity.getHealth() > 1) {
+            case Effect.FATAL_POISON:
+                if (entity.getHealth() > 1 || this.id == FATAL_POISON) {
                     entity.attack(new EntityDamageEvent(entity, DamageCause.MAGIC, 1));
                 }
                 break;