diff --git a/src/data/ability.ts b/src/data/ability.ts
index eec1240e1d3..38477132a05 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -3434,7 +3434,8 @@ export function initAbilities() {
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
       .attr(NoTransformAbilityAbAttr)
-      .attr(NoFusionAbilityAbAttr),
+      .attr(NoFusionAbilityAbAttr)
+      .condition((pokemon) => !pokemon.isTerastallized()),
     new Ability(Abilities.QUICK_DRAW, 8)
       .unimplemented(),
     new Ability(Abilities.UNSEEN_FIST, 8)