diff --git a/src/data/battler-tags.ts b/src/data/battler-tags.ts
index b7b767e505b..1199ac581a6 100644
--- a/src/data/battler-tags.ts
+++ b/src/data/battler-tags.ts
@@ -2722,7 +2722,7 @@ export class StockpilingTag extends SerializableBattlerTag {
         true,
         false,
         true,
-        this.onStatStagesChanged,
+        this.onStatStagesChanged.bind(this),
       );
     }
   }