diff --git a/cl_dll/com_weapons.cpp b/cl_dll/com_weapons.cpp
index bde07f082..84641073e 100644
--- a/cl_dll/com_weapons.cpp
+++ b/cl_dll/com_weapons.cpp
@@ -127,7 +127,7 @@ Directly queue up an event on the client
 =====================
 */
 void HUD_PlaybackEvent( int flags, const edict_t *pInvoker, unsigned short eventindex, float delay,
-	float *origin, float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 )
+	const float *origin, const float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 )
 {
 	Vector org;
 	Vector ang;
@@ -138,7 +138,7 @@ void HUD_PlaybackEvent( int flags, const edict_t *pInvoker, unsigned short event
 	// Weapon prediction events are assumed to occur at the player's origin
 	org			= g_finalstate->playerstate.origin;
 	ang			= v_client_aimangles;
-	gEngfuncs.pfnPlaybackEvent( flags, pInvoker, eventindex, delay, (float *)&org, (float *)&ang, fparam1, fparam2, iparam1, iparam2, bparam1, bparam2 );
+	gEngfuncs.pfnPlaybackEvent( flags, pInvoker, eventindex, delay, org, ang, fparam1, fparam2, iparam1, iparam2, bparam1, bparam2 );
 }
 
 /*
diff --git a/cl_dll/com_weapons.h b/cl_dll/com_weapons.h
index 76605f5d2..05aea4396 100644
--- a/cl_dll/com_weapons.h
+++ b/cl_dll/com_weapons.h
@@ -24,7 +24,7 @@ int				UTIL_SharedRandomLong( unsigned int seed, int low, int high );
 int				HUD_GetWeaponAnim();
 void			HUD_SendWeaponAnim( int iAnim, int body, int force );
 void			HUD_PlaySound( const char *sound, float volume );
-void			HUD_PlaybackEvent( int flags, const struct edict_s *pInvoker, unsigned short eventindex, float delay, float *origin, float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
+void			HUD_PlaybackEvent( int flags, const struct edict_s *pInvoker, unsigned short eventindex, float delay, const float *origin, const float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
 void			HUD_SetMaxSpeed( const struct edict_s *ed, float speed );
 int				stub_PrecacheModel( const char* s );
 int				stub_PrecacheSound( const char* s );
diff --git a/dlls/crossbow.cpp b/dlls/crossbow.cpp
index 8cbdad631..6589e32bb 100644
--- a/dlls/crossbow.cpp
+++ b/dlls/crossbow.cpp
@@ -341,7 +341,7 @@ void CCrossbow::FireSniperBolt()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usCrossbow2, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0, 0, m_iClip, m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType], 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usCrossbow2, 0.0, g_vecZero, g_vecZero, 0, 0, m_iClip, m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType], 0, 0 );
 
 	// player "shoot" animation
 	m_pPlayer->SetAnimation( PLAYER_ATTACK1 );
@@ -384,7 +384,7 @@ void CCrossbow::FireBolt()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usCrossbow, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0, 0, m_iClip, m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType], 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usCrossbow, 0.0, g_vecZero, g_vecZero, 0, 0, m_iClip, m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType], 0, 0 );
 
 	// player "shoot" animation
 	m_pPlayer->SetAnimation( PLAYER_ATTACK1 );
diff --git a/dlls/crowbar.cpp b/dlls/crowbar.cpp
index 26cc3e97f..df8e8536b 100644
--- a/dlls/crowbar.cpp
+++ b/dlls/crowbar.cpp
@@ -179,7 +179,7 @@ int CCrowbar::Swing( int fFirst )
 #endif
 
 	PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usCrowbar, 
-	0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0, 0, 0,
+	0.0, g_vecZero, g_vecZero, 0, 0, 0,
 	0.0, 0, 0.0 );
 
 
diff --git a/dlls/egon.cpp b/dlls/egon.cpp
index eb8dca0e9..93f892f28 100644
--- a/dlls/egon.cpp
+++ b/dlls/egon.cpp
@@ -182,7 +182,7 @@ void CEgon::Attack()
 
 			m_flAmmoUseTime = gpGlobals->time;// start using ammo ASAP.
 
-			PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usEgonFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, m_fireState, m_fireMode, 1, 0 );
+			PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usEgonFire, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, m_fireState, m_fireMode, 1, 0 );
 						
 			m_shakeTime = 0;
 
@@ -202,7 +202,7 @@ void CEgon::Attack()
 		
 			if ( pev->fuser1 <= UTIL_WeaponTimeBase() )
 			{
-				PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usEgonFire, 0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, m_fireState, m_fireMode, 0, 0 );
+				PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usEgonFire, 0, g_vecZero, g_vecZero, 0.0, 0.0, m_fireState, m_fireMode, 0, 0 );
 				pev->fuser1 = 1000;
 			}
 
@@ -513,7 +513,7 @@ void CEgon::EndAttack()
 	if ( m_fireState != FIRE_OFF ) //Checking the button just in case!.
 		 bMakeNoise = true;
 
-	PLAYBACK_EVENT_FULL( FEV_GLOBAL | FEV_RELIABLE, m_pPlayer->edict(), m_usEgonStop, 0, (float *)&m_pPlayer->pev->origin, (float *)&m_pPlayer->pev->angles, 0.0, 0.0, bMakeNoise, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( FEV_GLOBAL | FEV_RELIABLE, m_pPlayer->edict(), m_usEgonStop, 0, m_pPlayer->pev->origin, m_pPlayer->pev->angles, 0.0, 0.0, bMakeNoise, 0, 0, 0 );
 
 	m_flTimeWeaponIdle = UTIL_WeaponTimeBase() + 2.0;
 	m_flNextPrimaryAttack = m_flNextSecondaryAttack = UTIL_WeaponTimeBase() + 0.5;
diff --git a/dlls/gauss.cpp b/dlls/gauss.cpp
index 662f5acaf..dd2328616 100644
--- a/dlls/gauss.cpp
+++ b/dlls/gauss.cpp
@@ -117,7 +117,7 @@ BOOL CGauss::Deploy( )
 
 void CGauss::Holster( int skiplocal /* = 0 */ )
 {
-	PLAYBACK_EVENT_FULL( FEV_RELIABLE | FEV_GLOBAL, m_pPlayer->edict(), m_usGaussFire, 0.01, (float *)&m_pPlayer->pev->origin, (float *)&m_pPlayer->pev->angles, 0.0, 0.0, 0, 0, 0, 1 );
+	PLAYBACK_EVENT_FULL( FEV_RELIABLE | FEV_GLOBAL, m_pPlayer->edict(), m_usGaussFire, 0.01, m_pPlayer->pev->origin, m_pPlayer->pev->angles, 0.0, 0.0, 0, 0, 0, 1 );
 	
 	m_pPlayer->m_flNextAttack = UTIL_WeaponTimeBase() + 0.5;
 	
@@ -197,7 +197,7 @@ void CGauss::SecondaryAttack()
 		m_pPlayer->m_flStartCharge = gpGlobals->time;
 		m_pPlayer->m_flAmmoStartCharge = UTIL_WeaponTimeBase() + GetFullChargeTime();
 
-		PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussSpin, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, 110, 0, 0, 0 );
+		PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussSpin, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, 110, 0, 0, 0 );
 
 		m_iSoundState = SND_CHANGE_PITCH;
 	}
@@ -255,7 +255,7 @@ void CGauss::SecondaryAttack()
 		if ( m_iSoundState == 0 )
 			ALERT( at_console, "sound state %d\n", m_iSoundState );
 
-		PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussSpin, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, pitch, 0, ( m_iSoundState == SND_CHANGE_PITCH ) ? 1 : 0, 0 );
+		PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussSpin, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, pitch, 0, ( m_iSoundState == SND_CHANGE_PITCH ) ? 1 : 0, 0 );
 
 		m_iSoundState = SND_CHANGE_PITCH; // hack for going through level transitions
 
@@ -368,13 +368,13 @@ void CGauss::Fire( Vector vecOrigSrc, Vector vecDir, float flDamage )
 #endif
 	
 	// The main firing event is sent unreliably so it won't be delayed.
-	PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussFire, 0.0, (float *)&m_pPlayer->pev->origin, (float *)&m_pPlayer->pev->angles, flDamage, 0.0, 0, 0, m_fPrimaryFire ? 1 : 0, 0 );
+	PLAYBACK_EVENT_FULL( FEV_NOTHOST, m_pPlayer->edict(), m_usGaussFire, 0.0, m_pPlayer->pev->origin, m_pPlayer->pev->angles, flDamage, 0.0, 0, 0, m_fPrimaryFire ? 1 : 0, 0 );
 
 	// This reliable event is used to stop the spinning sound
 	// It's delayed by a fraction of second to make sure it is delayed by 1 frame on the client
 	// It's sent reliably anyway, which could lead to other delays
 
-	PLAYBACK_EVENT_FULL( FEV_NOTHOST | FEV_RELIABLE, m_pPlayer->edict(), m_usGaussFire, 0.01, (float *)&m_pPlayer->pev->origin, (float *)&m_pPlayer->pev->angles, 0.0, 0.0, 0, 0, 0, 1 );
+	PLAYBACK_EVENT_FULL( FEV_NOTHOST | FEV_RELIABLE, m_pPlayer->edict(), m_usGaussFire, 0.01, m_pPlayer->pev->origin, m_pPlayer->pev->angles, 0.0, 0.0, 0, 0, 0, 1 );
 
 	
 	/*ALERT( at_console, "%f %f %f\n%f %f %f\n", 
diff --git a/dlls/hornetgun.cpp b/dlls/hornetgun.cpp
index a6a6c0cfc..218d2cc0c 100644
--- a/dlls/hornetgun.cpp
+++ b/dlls/hornetgun.cpp
@@ -151,7 +151,7 @@ void CHgun::PrimaryAttack()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usHornetFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, FIREMODE_TRACK, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usHornetFire, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, FIREMODE_TRACK, 0, 0, 0 );
 
 	
 
@@ -238,7 +238,7 @@ void CHgun::SecondaryAttack()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usHornetFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, FIREMODE_FAST, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usHornetFire, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, FIREMODE_FAST, 0, 0, 0 );
 
 
 	m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType]--;
diff --git a/dlls/mp5.cpp b/dlls/mp5.cpp
index 74f5953f7..0390670cd 100644
--- a/dlls/mp5.cpp
+++ b/dlls/mp5.cpp
@@ -161,7 +161,7 @@ void CMP5::PrimaryAttack()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usMP5, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usMP5, 0.0, g_vecZero, g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
 
 	if (!m_iClip && m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType] <= 0)
 		// HEV suit - indicate out of ammo condition
diff --git a/dlls/plats.cpp b/dlls/plats.cpp
index 9144dbfee..b568378b1 100644
--- a/dlls/plats.cpp
+++ b/dlls/plats.cpp
@@ -1113,7 +1113,7 @@ void CFuncTrackTrain :: StopSound()
 		us_encode = us_sound;
 
 		PLAYBACK_EVENT_FULL( FEV_RELIABLE | FEV_UPDATE, edict(), m_usAdjustPitch, 0.0, 
-			(float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, us_encode, 0, 1, 0 );
+			g_vecZero, g_vecZero, 0.0, 0.0, us_encode, 0, 1, 0 );
 
 		/*
 		STOP_SOUND(ENT(pev), CHAN_STATIC, (char*)STRING(pev->noise));
@@ -1163,7 +1163,7 @@ void CFuncTrackTrain :: UpdateSound()
 		us_encode = us_sound | us_pitch | us_volume;
 
 		PLAYBACK_EVENT_FULL( FEV_RELIABLE | FEV_UPDATE, edict(), m_usAdjustPitch, 0.0, 
-			(float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, us_encode, 0, 0, 0 );
+			g_vecZero, g_vecZero, 0.0, 0.0, us_encode, 0, 0, 0 );
 	}
 }
 
diff --git a/dlls/python.cpp b/dlls/python.cpp
index c04a4677f..c909a6960 100644
--- a/dlls/python.cpp
+++ b/dlls/python.cpp
@@ -189,7 +189,7 @@ void CPython::PrimaryAttack()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usFirePython, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usFirePython, 0.0, g_vecZero, g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
 
 	if (!m_iClip && m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType] <= 0)
 		// HEV suit - indicate out of ammo condition
diff --git a/dlls/shotgun.cpp b/dlls/shotgun.cpp
index c783f7772..7e8da4fb2 100644
--- a/dlls/shotgun.cpp
+++ b/dlls/shotgun.cpp
@@ -156,7 +156,7 @@ void CShotgun::PrimaryAttack()
 		vecDir = m_pPlayer->FireBulletsPlayer( 6, vecSrc, vecAiming, VECTOR_CONE_10DEGREES, 2048, BULLET_PLAYER_BUCKSHOT, 0, 0, m_pPlayer->pev, m_pPlayer->random_seed );
 	}
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usSingleFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usSingleFire, 0.0, g_vecZero, g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
 
 
 	if (!m_iClip && m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType] <= 0)
@@ -231,7 +231,7 @@ void CShotgun::SecondaryAttack()
 		vecDir = m_pPlayer->FireBulletsPlayer( 12, vecSrc, vecAiming, VECTOR_CONE_10DEGREES, 2048, BULLET_PLAYER_BUCKSHOT, 0, 0, m_pPlayer->pev, m_pPlayer->random_seed );
 	}
 		
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usDoubleFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usDoubleFire, 0.0, g_vecZero, g_vecZero, vecDir.x, vecDir.y, 0, 0, 0, 0 );
 
 	if (!m_iClip && m_pPlayer->m_rgAmmo[m_iPrimaryAmmoType] <= 0)
 		// HEV suit - indicate out of ammo condition
diff --git a/dlls/squeakgrenade.cpp b/dlls/squeakgrenade.cpp
index e7c8b7422..225b8947f 100644
--- a/dlls/squeakgrenade.cpp
+++ b/dlls/squeakgrenade.cpp
@@ -517,7 +517,7 @@ void CSqueak::PrimaryAttack()
 	flags = 0;
 #endif
 
-	    PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usSnarkFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
+	    PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usSnarkFire, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
 
 		if ( tr.fAllSolid == 0 && tr.fStartSolid == 0 && tr.flFraction > 0.25 )
 		{
diff --git a/dlls/tripmine.cpp b/dlls/tripmine.cpp
index 6a9a9e9b5..850070416 100644
--- a/dlls/tripmine.cpp
+++ b/dlls/tripmine.cpp
@@ -433,7 +433,7 @@ void CTripmine::PrimaryAttack()
 	flags = 0;
 #endif
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usTripFire, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), m_usTripFire, 0.0, g_vecZero, g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
 
 	if (tr.flFraction < 1.0)
 	{
diff --git a/dlls/util.h b/dlls/util.h
index ad3286830..d62e76939 100644
--- a/dlls/util.h
+++ b/dlls/util.h
@@ -495,8 +495,8 @@ void EMIT_GROUPNAME_SUIT(edict_t *entity, const char *groupname);
 
 #define RANDOM_SOUND_ARRAY( array ) (array) [ RANDOM_LONG(0,ARRAYSIZE( (array) )-1) ]
 
-#define PLAYBACK_EVENT( flags, who, index ) PLAYBACK_EVENT_FULL( flags, who, index, 0, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
-#define PLAYBACK_EVENT_DELAY( flags, who, index, delay ) PLAYBACK_EVENT_FULL( flags, who, index, delay, (float *)&g_vecZero, (float *)&g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
+#define PLAYBACK_EVENT( flags, who, index ) PLAYBACK_EVENT_FULL( flags, who, index, 0, g_vecZero, g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
+#define PLAYBACK_EVENT_DELAY( flags, who, index, delay ) PLAYBACK_EVENT_FULL( flags, who, index, delay, g_vecZero, g_vecZero, 0.0, 0.0, 0, 0, 0, 0 );
 
 #define GROUP_OP_AND	0
 #define GROUP_OP_NAND	1
diff --git a/dlls/wpn_shared/hl_wpn_glock.cpp b/dlls/wpn_shared/hl_wpn_glock.cpp
index 64c3408b4..13607adac 100644
--- a/dlls/wpn_shared/hl_wpn_glock.cpp
+++ b/dlls/wpn_shared/hl_wpn_glock.cpp
@@ -145,7 +145,7 @@ void CGlock::GlockFire( float flSpread , float flCycleTime, BOOL fUseAutoAim )
 	Vector vecDir;
 	vecDir = m_pPlayer->FireBulletsPlayer( 1, vecSrc, vecAiming, Vector( flSpread, flSpread, flSpread ), 8192, BULLET_PLAYER_9MM, 0, 0, m_pPlayer->pev, m_pPlayer->random_seed );
 
-	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), fUseAutoAim ? m_usFireGlock1 : m_usFireGlock2, 0.0, (float *)&g_vecZero, (float *)&g_vecZero, vecDir.x, vecDir.y, 0, 0, ( m_iClip == 0 ) ? 1 : 0, 0 );
+	PLAYBACK_EVENT_FULL( flags, m_pPlayer->edict(), fUseAutoAim ? m_usFireGlock1 : m_usFireGlock2, 0.0, g_vecZero, g_vecZero, vecDir.x, vecDir.y, 0, 0, ( m_iClip == 0 ) ? 1 : 0, 0 );
 
 	m_flNextPrimaryAttack = m_flNextSecondaryAttack = GetNextAttackDelay(flCycleTime);
 
diff --git a/engine/APIProxy.h b/engine/APIProxy.h
index 12a9eec4b..6265c7578 100644
--- a/engine/APIProxy.h
+++ b/engine/APIProxy.h
@@ -286,7 +286,7 @@ typedef int							(*pfnEngSrc_CL_CreateVisibleEntity_t )	( int type, struct cl_e
 typedef const struct model_s *		(*pfnEngSrc_GetSpritePointer_t )		( HSPRITE hSprite );
 typedef void						(*pfnEngSrc_pfnPlaySoundByNameAtLocation_t )	( const char *szSound, float volume, float *origin );
 typedef unsigned short				(*pfnEngSrc_pfnPrecacheEvent_t )		( int type, const char* psz );
-typedef void						(*pfnEngSrc_pfnPlaybackEvent_t )		( int flags, const struct edict_s *pInvoker, unsigned short eventindex, float delay, float *origin, float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
+typedef void						(*pfnEngSrc_pfnPlaybackEvent_t )		( int flags, const struct edict_s *pInvoker, unsigned short eventindex, float delay, const float *origin, const float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
 typedef void						(*pfnEngSrc_pfnWeaponAnim_t )			( int iAnim, int body );
 typedef float						(*pfnEngSrc_pfnRandomFloat_t )			( float flLow, float flHigh );
 typedef int32						(*pfnEngSrc_pfnRandomLong_t )			( int32 lLow, int32 lHigh );
diff --git a/engine/eiface.h b/engine/eiface.h
index 0a1742a54..918663676 100644
--- a/engine/eiface.h
+++ b/engine/eiface.h
@@ -231,7 +231,7 @@ typedef struct enginefuncs_s
 	void		(*pfnSetPhysicsKeyValue)	( const edict_t *pClient, const char *key, const char *value );
 	const char *(*pfnGetPhysicsInfoString)	( const edict_t *pClient );
 	unsigned short (*pfnPrecacheEvent)		( int type, const char*psz );
-	void		(*pfnPlaybackEvent)			( int flags, const edict_t *pInvoker, unsigned short eventindex, float delay, float *origin, float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
+	void		(*pfnPlaybackEvent)			( int flags, const edict_t *pInvoker, unsigned short eventindex, float delay, const float *origin, const float *angles, float fparam1, float fparam2, int iparam1, int iparam2, int bparam1, int bparam2 );
 
 	unsigned char *(*pfnSetFatPVS)			( float *org );
 	unsigned char *(*pfnSetFatPAS)			( float *org );