diff --git a/src/game/AI/ScriptDevAI/scripts/outland/boss_doomwalker.cpp b/src/game/AI/ScriptDevAI/scripts/outland/boss_doomwalker.cpp
index a1c8238834..2a7222124e 100644
--- a/src/game/AI/ScriptDevAI/scripts/outland/boss_doomwalker.cpp
+++ b/src/game/AI/ScriptDevAI/scripts/outland/boss_doomwalker.cpp
@@ -102,7 +102,7 @@ struct boss_doomwalkerAI : public CombatAI
     void KilledUnit(Unit* victim) override
     {
         CombatAI::KilledUnit(victim);
-        if (victim->IsPlayer())
+        if (!victim->IsPlayer())
             return;
 
         victim->CastSpell(nullptr, SPELL_MARK_OF_DEATH_PLAYER, TRIGGERED_OLD_TRIGGERED, nullptr, nullptr, m_creature->GetObjectGuid());