diff --git a/src/game/server/hl/monsterstate.cpp b/src/game/server/hl/monsterstate.cpp
index cc1c65c8..b7816dcd 100644
--- a/src/game/server/hl/monsterstate.cpp
+++ b/src/game/server/hl/monsterstate.cpp
@@ -66,7 +66,7 @@ void CBaseMonster ::RunAI(void)
 
 	// IDLE sound permitted in ALERT state is because monsters were silent in ALERT state. Only play IDLE sound in IDLE state
 	// once we have sounds for that state.
-	if ((m_MonsterState == MONSTERSTATE_IDLE || m_MonsterState == MONSTERSTATE_ALERT) && RANDOM_LONG(0, 99) == 0 && !(pev->flags & SF_MONSTER_GAG))
+	if ((m_MonsterState == MONSTERSTATE_IDLE || m_MonsterState == MONSTERSTATE_ALERT) && RANDOM_LONG(0, 99) == 0 && !(pev->spawnflags & SF_MONSTER_GAG))
 	{
 		IdleSound();
 	}