diff --git a/src/battle_util.c b/src/battle_util.c
index 39a25b564b..defe6e31d0 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -2351,7 +2351,7 @@ u8 DoBattlerEndTurnEffects(void)
                 gBattleScripting.animArg1 = gBattlerTarget;
                 gBattleScripting.animArg2 = gBattlerAttacker;
                 gBattleStruct->moveDamage[gBattlerAttacker] = max(1, GetNonDynamaxMaxHP(battler) / 8);
-                gBattleStruct->moveDamage[gBattlerTarget] = GetDrainedBigRootHp(gBattlerAttacker, gBattleStruct->moveDamage[gBattlerAttacker]);
+                gBattleStruct->moveDamage[gBattlerTarget] = GetDrainedBigRootHp(gBattlerTarget, gBattleStruct->moveDamage[gBattlerAttacker]);
                 gHitMarker |= HITMARKER_IGNORE_SUBSTITUTE | HITMARKER_PASSIVE_DAMAGE;
                 if (GetBattlerAbility(battler) == ABILITY_LIQUID_OOZE)
                 {
diff --git a/test/battle/hold_effect/big_root.c b/test/battle/hold_effect/big_root.c
index 0b3d9b4af6..41dd09adc0 100644
--- a/test/battle/hold_effect/big_root.c
+++ b/test/battle/hold_effect/big_root.c
@@ -30,8 +30,6 @@ SINGLE_BATTLE_TEST("Big Root increases healing from absorbing moves", s16 damage
 
 SINGLE_BATTLE_TEST("Big Root increases the damage restored from Leech Seed, Ingrain and Aqua Ring", s16 heal, s16 damage)
 {
-    KNOWN_FAILING;
-
     u32 item;
     u32 move;
 
@@ -53,9 +51,9 @@ SINGLE_BATTLE_TEST("Big Root increases the damage restored from Leech Seed, Ingr
         HP_BAR(player, captureDamage: &results[i].heal);
     } FINALLY {
         EXPECT_EQ(results[0].damage, results[1].damage); // Damage is unaffected
-        EXPECT_MUL_EQ(results[1].heal, Q_4_12(5234 / 4096), results[0].heal);
-        EXPECT_MUL_EQ(results[3].heal, Q_4_12(5234 / 4096), results[2].heal);
-        EXPECT_MUL_EQ(results[5].heal, Q_4_12(5234 / 4096), results[4].heal);
+        EXPECT_MUL_EQ(results[0].heal, Q_4_12(1.3), results[1].heal);
+        EXPECT_MUL_EQ(results[2].heal, Q_4_12(1.3), results[3].heal);
+        EXPECT_MUL_EQ(results[4].heal, Q_4_12(1.3), results[5].heal);
     }
 }