diff --git a/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts b/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
index e464e1912dc..c994c6e993f 100644
--- a/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
+++ b/src/data/mystery-encounters/encounters/the-strong-stuff-encounter.ts
@@ -117,7 +117,7 @@ export const TheStrongStuffEncounter: MysteryEncounter = MysteryEncounterBuilder
           mysteryEncounterBattleEffects: (pokemon: Pokemon) => {
             queueEncounterMessage(`${namespace}:option.2.stat_boost`);
             globalScene.unshiftPhase(
-              new StatStageChangePhase(pokemon.getBattlerIndex(), true, [Stat.DEF, Stat.SPDEF],
+              new StatStageChangePhase(pokemon.getBattlerIndex(), true, [Stat.DEF, Stat.SPDEF], 1),
             );
           },
         },