diff --git a/src/battle_util.c b/src/battle_util.c
index 440212d9bf..a3b8454c66 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -2709,7 +2709,8 @@ u8 AbilityBattleEffects(u8 caseID, u8 battler, u8 ability, u8 special, u16 moveA
         case ABILITY_IMPOSTER:
             if (IsBattlerAlive(BATTLE_OPPOSITE(battler))
                 && !(gBattleMons[BATTLE_OPPOSITE(battler)].status2 & (STATUS2_TRANSFORMED | STATUS2_SUBSTITUTE))
-                && !(gBattleMons[battler].status2 & STATUS2_TRANSFORMED))
+                && !(gBattleMons[battler].status2 & STATUS2_TRANSFORMED)
+                && !(gStatuses3[BATTLE_OPPOSITE(battler)] & STATUS3_SEMI_INVULNERABLE))
             {
                 gBattlerTarget = BATTLE_OPPOSITE(battler);
                 BattleScriptPushCursorAndCallback(BattleScript_ImposterActivates);