diff --git a/game/shared/takedamageinfo.h b/game/shared/takedamageinfo.h
index 7b58b09d..c7678aec 100644
--- a/game/shared/takedamageinfo.h
+++ b/game/shared/takedamageinfo.h
@@ -102,6 +102,7 @@ protected:
 	Vector			m_vecDamageForce;
 	Vector			m_vecDamagePosition;
 	Vector			m_vecReportedPosition;	// Position players are told damage is coming from
+	Vector			m_vecUnknown;
 	EHANDLE			m_hInflictor;
 	EHANDLE			m_hAttacker;
 	EHANDLE			m_hWeapon;