diff --git a/src/data/move.ts b/src/data/move.ts
index 9141d14f811..857ba49c317 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -1936,7 +1936,7 @@ export class IncrementMovePriorityAttr extends MoveAttr {
  */
 export class MultiHitAttr extends MoveAttr {
   /** This move's intrinsic multi-hit type. It should never be modified. */
-  private intrinsicMultiHitType: MultiHitType;
+  private readonly intrinsicMultiHitType: MultiHitType;
   /** This move's current multi-hit type. It may be temporarily modified by abilities (e.g., Battle Bond). */
   private multiHitType: MultiHitType;