diff --git a/extensions/sdkhooks/extension.cpp b/extensions/sdkhooks/extension.cpp
index 25bf9c13..b5af51ca 100644
--- a/extensions/sdkhooks/extension.cpp
+++ b/extensions/sdkhooks/extension.cpp
@@ -175,8 +175,8 @@ SH_DECL_MANUALHOOK0_void(Spawn, 0, 0, 0);
 SH_DECL_MANUALHOOK1_void(StartTouch, 0, 0, 0, CBaseEntity *);
 SH_DECL_MANUALHOOK0_void(Think, 0, 0, 0);
 SH_DECL_MANUALHOOK1_void(Touch, 0, 0, 0, CBaseEntity *);
-#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2
-SH_DECL_MANUALHOOK4_void(TraceAttack, 0, 0, 0, CTakeDamageInfoHack &, const Vector &, CGameTrace *, void *);
+#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2 || SOURCE_ENGINE == SE_SDK2013
+SH_DECL_MANUALHOOK4_void(TraceAttack, 0, 0, 0, CTakeDamageInfoHack &, const Vector &, CGameTrace *, CDmgAccumulator *);
 #else
 SH_DECL_MANUALHOOK3_void(TraceAttack, 0, 0, 0, CTakeDamageInfoHack &, const Vector &, CGameTrace *);
 #endif
@@ -1292,8 +1292,8 @@ void SDKHooks::Hook_TouchPost(CBaseEntity *pOther)
 	RETURN_META(MRES_IGNORED);
 }
 
-#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2
-void SDKHooks::Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, void *pUnknownJK)
+#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2 || SOURCE_ENGINE == SE_SDK2013
+void SDKHooks::Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator)
 #else
 void SDKHooks::Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr)
 #endif
@@ -1357,8 +1357,8 @@ void SDKHooks::Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir,
 	RETURN_META(MRES_IGNORED);
 }
 
-#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2
-void SDKHooks::Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, void *pUnknownJK)
+#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2 || SOURCE_ENGINE == SE_SDK2013
+void SDKHooks::Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator)
 #else
 void SDKHooks::Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr)
 #endif
diff --git a/extensions/sdkhooks/extension.h b/extensions/sdkhooks/extension.h
index df2e68ec..566021a3 100644
--- a/extensions/sdkhooks/extension.h
+++ b/extensions/sdkhooks/extension.h
@@ -101,7 +101,9 @@ typedef void *(*ReticulateSplines)();
 /**
  * Classes
  */
+
 class IPhysicsObject;
+class CDmgAccumulator;
 typedef CBaseEntity CBaseCombatWeapon;
 
 class HookList
@@ -283,9 +285,9 @@ public:
 	void Hook_ThinkPost();
 	void Hook_Touch(CBaseEntity *pOther);
 	void Hook_TouchPost(CBaseEntity *pOther);
-#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2
-	void Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, void *pUnknownJK);
-	void Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, void *pUnknownJK);
+#if SOURCE_ENGINE == SE_HL2DM || SOURCE_ENGINE == SE_DODS || SOURCE_ENGINE == SE_CSS || SOURCE_ENGINE == SE_TF2 || SOURCE_ENGINE == SE_SDK2013
+	void Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator);
+	void Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr, CDmgAccumulator *pAccumulator);
 #else
 	void Hook_TraceAttack(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr);
 	void Hook_TraceAttackPost(CTakeDamageInfoHack &info, const Vector &vecDir, trace_t *ptr);