diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index d4803177f07..f30b275ae68 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -950,7 +950,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
    * @param ignoreHeldItems determines whether this Pokemon's held items should be ignored during the stat calculation, default `false`
    * @returns the final in-battle value of a stat
    */
-  getEffectiveStat(stat: EffectiveStat, opponent?: Pokemon, move?: Move, ignoreAbility: boolean = false, ignoreOppAbility: boolean = false, isCritical: boolean = false, simulated: boolean = true, ignoreHeldItems: boolean = false): integer {
+  getEffectiveStat(stat: EffectiveStat, opponent?: Pokemon, move?: Move, ignoreAbility: boolean = false, ignoreOppAbility: boolean = false, isCritical: boolean = false, simulated: boolean = true, ignoreHeldItems: boolean = false): number {
     const statValue = new Utils.NumberHolder(this.getStat(stat, false));
     if (!ignoreHeldItems) {
       globalScene.applyModifiers(StatBoosterModifier, this.isPlayer(), this, stat, statValue);