diff --git a/src/code/z_parameter.c b/src/code/z_parameter.c
index 73bdc2937..50cf0f4e2 100644
--- a/src/code/z_parameter.c
+++ b/src/code/z_parameter.c
@@ -1026,7 +1026,7 @@ void Inventory_UpdateBottleItem(GlobalContext* globalCtx, u8 item, u8 btn) {
     gSaveContext.buttonStatus[btn] = BTN_ENABLED;
 
     if (item == ITEM_HOT_SPRING_WATER) {
-        func_8010EBA0(60, GET_CUR_FORM_BTN_SLOT(btn) - 18);
+        func_8010EBA0(60, GET_CUR_FORM_BTN_SLOT(btn) - SLOT_BOTTLE_1);
     }
 }