diff --git a/src/phases/pokemon-phase.ts b/src/phases/pokemon-phase.ts
index 44f1effa3a0..cc09f811cd7 100644
--- a/src/phases/pokemon-phase.ts
+++ b/src/phases/pokemon-phase.ts
@@ -8,7 +8,7 @@ export abstract class PokemonPhase extends FieldPhase {
   public player: boolean;
   public fieldIndex: number;
 
-  constructor(battlerIndex?: BattlerIndex) {
+  constructor(battlerIndex?: BattlerIndex | number) {
     super();
 
     battlerIndex =