diff --git a/src/data/ability.ts b/src/data/ability.ts
index 32688239342..3b9cbc448fc 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -2777,7 +2777,7 @@ export function initAbilities() {
     new Ability(Abilities.ANTICIPATION, 4)
       .conditionalAttr(getAnticipationCondition(), PostSummonMessageAbAttr, (pokemon: Pokemon) => getPokemonMessage(pokemon, ' shuddered!')),
     new Ability(Abilities.FOREWARN, 4)
-      .unimplemented(),
+      .attr(ForewarnAbAttr),
     new Ability(Abilities.UNAWARE, 4)
       .attr(IgnoreOpponentStatChangesAbAttr)
       .ignorable(),