diff --git a/src/battle_util.c b/src/battle_util.c
index 910b59fe3a..d6730d3314 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -5882,7 +5882,7 @@ static u32 CalcMoveBasePowerAfterModifiers(u16 move, u8 battlerAtk, u8 battlerDe
             MulModifier(&modifier, UQ_4_12(2.0));
         break;
     case EFFECT_BRINE:
-        if (gBattleMons[battlerAtk].hp <= (gBattleMons[battlerAtk].maxHP / 2))
+        if (gBattleMons[battlerDef].hp <= (gBattleMons[battlerDef].maxHP / 2))
             MulModifier(&modifier, UQ_4_12(2.0));
         break;
     case EFFECT_VENOSHOCK: