diff --git a/src/data/ability.ts b/src/data/ability.ts
index f135cfcf6..7097c4e2f 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -2106,7 +2106,7 @@ export class StatChangeMultiplierAbAttr extends AbAttr {
 
 export class StatChangeThiefAbAttr extends AbAttr {
   apply(pokemon: Pokemon, passive: boolean, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
-    pokemon.scene.unshiftPhase(new StatChangePhase(pokemon.scene, pokemon.getBattlerIndex(), true, (args[0] as BattleStat[]), (args[1] as integer), true, true));
+    pokemon.scene.unshiftPhase(new StatChangePhase(pokemon.scene, pokemon.getBattlerIndex(), true, (args[0] as BattleStat[]), (args[1] as integer), true, false, true));
     return true;
   }
 }
diff --git a/src/phases.ts b/src/phases.ts
index 351255786..ba0430d52 100644
--- a/src/phases.ts
+++ b/src/phases.ts
@@ -2661,8 +2661,9 @@ export class StatChangePhase extends PokemonPhase {
   private levels: integer;
   private showMessage: boolean;
   private ignoreAbilities: boolean;
+  private ignoreOpportunist: boolean;
 
-  constructor(scene: BattleScene, battlerIndex: BattlerIndex, selfTarget: boolean, stats: BattleStat[], levels: integer, showMessage: boolean = true, ignoreAbilities: boolean = false) {
+  constructor(scene: BattleScene, battlerIndex: BattlerIndex, selfTarget: boolean, stats: BattleStat[], levels: integer, showMessage: boolean = true, ignoreAbilities: boolean = false, ignoreOpportunist: boolean = false) {
     super(scene, battlerIndex);
 
     this.selfTarget = selfTarget;
@@ -2670,6 +2671,7 @@ export class StatChangePhase extends PokemonPhase {
     this.levels = levels;
     this.showMessage = showMessage;
     this.ignoreAbilities = ignoreAbilities;
+    this.ignoreOpportunist = ignoreOpportunist;
   }
 
   start() {
@@ -2717,7 +2719,7 @@ export class StatChangePhase extends PokemonPhase {
       for (let stat of filteredStats)
         pokemon.summonData.battleStats[stat] = Math.max(Math.min(pokemon.summonData.battleStats[stat] + levels.value, 6), -6);
       
-      if (levels.value > 0 && !this.ignoreAbilities)
+      if (levels.value > 0 && !this.ignoreOpportunist)
         for (let opponent of pokemon.getOpponents())
           applyAbAttrs(StatChangeThiefAbAttr, opponent, null, this.stats, levels.value);