diff --git a/reapi/include/cssdk/dlls/API/CSEntity.h b/reapi/include/cssdk/dlls/API/CSEntity.h
index 2c69f23..a179efa 100644
--- a/reapi/include/cssdk/dlls/API/CSEntity.h
+++ b/reapi/include/cssdk/dlls/API/CSEntity.h
@@ -38,8 +38,8 @@ public:
 	}
 
 	virtual ~CCSEntity() {}
-	virtual void FireBullets(int iShots, Vector &vecSrc, Vector &vecDirShooting, Vector &vecSpread, float flDistance, int iBulletType, int iTracerFreq, int iDamage, entvars_t *pevAttacker);
-	virtual Vector FireBullets3(Vector &vecSrc, Vector &vecDirShooting, float vecSpread, float flDistance, int iPenetration, int iBulletType, int iDamage, float flRangeModifier, entvars_t *pevAttacker, bool bPistol, int shared_rand);
+	virtual void FireBullets(int iShots, Vector &vecSrc, Vector &vecDirShooting, Vector &vecSpread, float flDistance, int iBulletType, int iTracerFreq, int iDamage, entvars_t *pevAttacker) = 0;
+	virtual Vector FireBullets3(Vector &vecSrc, Vector &vecDirShooting, float vecSpread, float flDistance, int iPenetration, int iBulletType, int iDamage, float flRangeModifier, entvars_t *pevAttacker, bool bPistol, int shared_rand) = 0;
 
 public:
 	CBaseEntity *m_pContainingEntity;
diff --git a/reapi/include/cssdk/dlls/API/CSPlayer.h b/reapi/include/cssdk/dlls/API/CSPlayer.h
index 3367818..1494509 100644
--- a/reapi/include/cssdk/dlls/API/CSPlayer.h
+++ b/reapi/include/cssdk/dlls/API/CSPlayer.h
@@ -50,51 +50,51 @@ public:
 		m_szModel[0] = '\0';
 	}
 
-	virtual bool IsConnected() const;
-	virtual void SetAnimation(PLAYER_ANIM playerAnim);
-	virtual void AddAccount(int amount, RewardType type = RT_NONE, bool bTrackChange = true);
-	virtual CBaseEntity *GiveNamedItem(const char *pszName);
-	virtual CBaseEntity *GiveNamedItemEx(const char *pszName);
-	virtual void GiveDefaultItems();
-	virtual void GiveShield(bool bDeploy = true);
-	virtual void DropShield(bool bDeploy = true);
-	virtual void DropPlayerItem(const char *pszItemName);
-	virtual bool RemoveShield();
-	virtual void RemoveAllItems(bool bRemoveSuit);
-	virtual bool RemovePlayerItem(const char* pszItemName);
-	virtual void SetPlayerModel(bool bHasC4);
-	virtual void SetPlayerModelEx(const char *modelName);
-	virtual void SetNewPlayerModel(const char *modelName);
-	virtual void ClientCommand(const char *cmd, const char *arg1 = nullptr, const char *arg2 = nullptr, const char *arg3 = nullptr);
-	virtual void SetProgressBarTime(int time);
-	virtual void SetProgressBarTime2(int time, float timeElapsed);
-	virtual struct edict_s *EntSelectSpawnPoint();
-	virtual void SetBombIcon(bool bFlash = false);
-	virtual void SetScoreAttrib(CBasePlayer *dest);
-	virtual void SendItemStatus();
-	virtual void ReloadWeapons(CBasePlayerItem *pWeapon = nullptr, bool bForceReload = false, bool bForceRefill = false);
-	virtual void Observer_SetMode(int iMode);
-	virtual bool SelectSpawnSpot(const char *pEntClassName, CBaseEntity* &pSpot);
-	virtual bool SwitchWeapon(CBasePlayerItem *pWeapon);
-	virtual void SwitchTeam();
-	virtual bool JoinTeam(TeamName team);
-	virtual void StartObserver(Vector& vecPosition, Vector& vecViewAngle);
-	virtual void TeamChangeUpdate();
-	virtual void DropSecondary();
-	virtual void DropPrimary();
-	virtual bool HasPlayerItem(CBasePlayerItem *pCheckItem);
-	virtual bool HasNamedPlayerItem(const char *pszItemName);
-	virtual CBasePlayerItem *GetItemById(WeaponIdType weaponID);
-	virtual CBasePlayerItem *GetItemByName(const char *itemName);
-	virtual void Disappear();
-	virtual void MakeVIP();
-	virtual bool MakeBomber();
-	virtual void ResetSequenceInfo();
-	virtual void StartDeathCam();
-	virtual bool RemovePlayerItemEx(const char* pszItemName, bool bRemoveAmmo);
-	virtual void SetSpawnProtection(float flProtectionTime);
-	virtual void RemoveSpawnProtection();
-	virtual bool HintMessageEx(const char *pMessage, float duration = 6.0f, bool bDisplayIfPlayerDead = false, bool bOverride = false);
+	virtual bool IsConnected() const = 0;
+	virtual void SetAnimation(PLAYER_ANIM playerAnim) = 0;
+	virtual void AddAccount(int amount, RewardType type = RT_NONE, bool bTrackChange = true) = 0;
+	virtual CBaseEntity *GiveNamedItem(const char *pszName) = 0;
+	virtual CBaseEntity *GiveNamedItemEx(const char *pszName) = 0;
+	virtual void GiveDefaultItems() = 0;
+	virtual void GiveShield(bool bDeploy = true) = 0;
+	virtual void DropShield(bool bDeploy = true) = 0;
+	virtual void DropPlayerItem(const char *pszItemName) = 0;
+	virtual bool RemoveShield() = 0;
+	virtual void RemoveAllItems(bool bRemoveSuit) = 0;
+	virtual bool RemovePlayerItem(const char* pszItemName) = 0;
+	virtual void SetPlayerModel(bool bHasC4) = 0;
+	virtual void SetPlayerModelEx(const char *modelName) = 0;
+	virtual void SetNewPlayerModel(const char *modelName) = 0;
+	virtual void ClientCommand(const char *cmd, const char *arg1 = nullptr, const char *arg2 = nullptr, const char *arg3 = nullptr) = 0;
+	virtual void SetProgressBarTime(int time) = 0;
+	virtual void SetProgressBarTime2(int time, float timeElapsed) = 0;
+	virtual struct edict_s *EntSelectSpawnPoint() = 0;
+	virtual void SetBombIcon(bool bFlash = false) = 0;
+	virtual void SetScoreAttrib(CBasePlayer *dest) = 0;
+	virtual void SendItemStatus() = 0;
+	virtual void ReloadWeapons(CBasePlayerItem *pWeapon = nullptr, bool bForceReload = false, bool bForceRefill = false) = 0;
+	virtual void Observer_SetMode(int iMode) = 0;
+	virtual bool SelectSpawnSpot(const char *pEntClassName, CBaseEntity* &pSpot) = 0;
+	virtual bool SwitchWeapon(CBasePlayerItem *pWeapon) = 0;
+	virtual void SwitchTeam() = 0;
+	virtual bool JoinTeam(TeamName team) = 0;
+	virtual void StartObserver(Vector& vecPosition, Vector& vecViewAngle) = 0;
+	virtual void TeamChangeUpdate() = 0;
+	virtual void DropSecondary() = 0;
+	virtual void DropPrimary() = 0;
+	virtual bool HasPlayerItem(CBasePlayerItem *pCheckItem) = 0;
+	virtual bool HasNamedPlayerItem(const char *pszItemName) = 0;
+	virtual CBasePlayerItem *GetItemById(WeaponIdType weaponID) = 0;
+	virtual CBasePlayerItem *GetItemByName(const char *itemName) = 0;
+	virtual void Disappear() = 0;
+	virtual void MakeVIP() = 0;
+	virtual bool MakeBomber() = 0;
+	virtual void ResetSequenceInfo() = 0;
+	virtual void StartDeathCam() = 0;
+	virtual bool RemovePlayerItemEx(const char* pszItemName, bool bRemoveAmmo) = 0;
+	virtual void SetSpawnProtection(float flProtectionTime) = 0;
+	virtual void RemoveSpawnProtection() = 0;
+	virtual bool HintMessageEx(const char *pMessage, float duration = 6.0f, bool bDisplayIfPlayerDead = false, bool bOverride = false) = 0;
 
 	void Reset();
 
diff --git a/reapi/include/cssdk/dlls/API/CSPlayerItem.h b/reapi/include/cssdk/dlls/API/CSPlayerItem.h
index 8c47d6e..cd67ea2 100644
--- a/reapi/include/cssdk/dlls/API/CSPlayerItem.h
+++ b/reapi/include/cssdk/dlls/API/CSPlayerItem.h
@@ -37,7 +37,7 @@ public:
 		Q_memset(&m_ItemInfo, 0, sizeof(m_ItemInfo));
 	}
 
-	virtual void SetItemInfo(ItemInfo *pInfo);
+	virtual void SetItemInfo(ItemInfo *pInfo) = 0;
 
 	CBasePlayerItem *BasePlayerItem() const;