diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index dc6ce74ecd..00963383b1 100755
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -17102,11 +17102,14 @@ void BS_ArenaJudgmentWindow(void)
     gBattlescriptCurrInstr = cmd->nextInstr;
 }
 
-static void SetArenMonLostValues(u32 battler)
+static void SetArenMonLostValues(u32 battler, u32 side)
 {
     gBattleMons[battler].hp = 0;
     gHitMarker |= HITMARKER_FAINTED(battler);
-    gBattleStruct->arenaLostOpponentMons |= 1u << gBattlerPartyIndexes[battler];
+    if (side == B_SIDE_PLAYER)
+        gBattleStruct->arenaLostPlayerMons |= 1u << gBattlerPartyIndexes[battler];
+    else
+        gBattleStruct->arenaLostOpponentMons |= 1u << gBattlerPartyIndexes[battler];
     gDisableStructs[battler].truantSwitchInHack = TRUE;
 }
 
@@ -17115,22 +17118,22 @@ static void SetArenMonLostValues(u32 battler)
 void BS_ArenaOpponentMonLost(void)
 {
     NATIVE_ARGS();
-    SetArenMonLostValues(opponentMon);
+    SetArenMonLostValues(opponentMon, B_SIDE_OPPONENT);
     gBattlescriptCurrInstr = cmd->nextInstr;
 }
 
 void BS_ArenaPlayerMonLost(void)
 {
     NATIVE_ARGS();
-    SetArenMonLostValues(playerMon);
+    SetArenMonLostValues(playerMon, B_SIDE_PLAYER);
     gBattlescriptCurrInstr = cmd->nextInstr;
 }
 
 void BS_ArenaBothMonsLost(void)
 {
     NATIVE_ARGS();
-    SetArenMonLostValues(playerMon);
-    SetArenMonLostValues(opponentMon);
+    SetArenMonLostValues(playerMon, B_SIDE_PLAYER);
+    SetArenMonLostValues(opponentMon, B_SIDE_OPPONENT);
     gBattlescriptCurrInstr = cmd->nextInstr;
 }
 #undef playerMon