diff --git a/cl_dll/cl_util.h b/cl_dll/cl_util.h
index 54dcede0..22555caa 100644
--- a/cl_dll/cl_util.h
+++ b/cl_dll/cl_util.h
@@ -94,8 +94,12 @@ inline void DrawSetTextColor( float r, float g, float b )
 inline int SPR_Height( HSPRITE x, int f )	{ return gEngfuncs.pfnSPR_Height(x, f); }
 inline int SPR_Width( HSPRITE x, int f )	{ return gEngfuncs.pfnSPR_Width(x, f); }
 
-inline 	client_textmessage_t	*TextMessageGet( const char *pName ) { return gEngfuncs.pfnTextMessageGet( pName ); }
-inline 	int						TextMessageDrawChar( int x, int y, int number, int r, int g, int b ) 
+inline client_textmessage_t *TextMessageGet( const char *pName )
+{
+	return gEngfuncs.pfnTextMessageGet( pName );
+}
+
+inline int TextMessageDrawChar( int x, int y, int number, int r, int g, int b ) 
 {
 	return gEngfuncs.pfnDrawCharacter( x, y, number, r, g, b ); 
 }
@@ -115,7 +119,7 @@ inline void GetConsoleStringSize( const char *string, int *width, int *height )
 		gEngfuncs.pfnDrawConsoleStringLen( (char*)string, width, height );
 }
 
-int DrawUtfString( int xpos, int ypos, int iMaxX, char *szIt, int r, int g, int b );
+int DrawUtfString( int xpos, int ypos, int iMaxX, const char *szIt, int r, int g, int b );
 
 inline int ConsoleStringLen( const char *string )
 {
diff --git a/cl_dll/com_weapons.cpp b/cl_dll/com_weapons.cpp
index e50de419..774df091 100644
--- a/cl_dll/com_weapons.cpp
+++ b/cl_dll/com_weapons.cpp
@@ -46,7 +46,7 @@ void COM_Log( const char *pszFile, const char *fmt, ... )
 	va_list		argptr;
 	char		string[1024];
 	FILE *fp;
-	char *pfilename;
+	const char *pfilename;
 
 	if( !pszFile )
 	{
diff --git a/cl_dll/hud_redraw.cpp b/cl_dll/hud_redraw.cpp
index 5182b484..829fd4b2 100644
--- a/cl_dll/hud_redraw.cpp
+++ b/cl_dll/hud_redraw.cpp
@@ -281,7 +281,7 @@ int CHud::DrawHudNumberString( int xpos, int ypos, int iMinX, int iNumber, int r
 int CHud::DrawHudStringReverse( int xpos, int ypos, int iMinX, const char *szString, int r, int g, int b )
 {
 	// find the end of the string
-	for( char *szIt = szString; *szIt != 0; szIt++ )
+	for( const char *szIt = szString; *szIt != 0; szIt++ )
 		xpos -= gHUD.m_scrinfo.charWidths[(unsigned char)*szIt];
 	if( xpos < iMinX )
 		xpos = iMinX;
diff --git a/cl_dll/text_message.cpp b/cl_dll/text_message.cpp
index 13b62577..58dae6f7 100644
--- a/cl_dll/text_message.cpp
+++ b/cl_dll/text_message.cpp
@@ -45,7 +45,7 @@ int CHudTextMessage::Init( void )
 char *CHudTextMessage::LocaliseTextString( const char *msg, char *dst_buffer, int buffer_size )
 {
 	char *dst = dst_buffer;
-	for( char *src = msg; *src != 0 && buffer_size > 0; buffer_size-- )
+	for( char *src = (char*)msg; *src != 0 && buffer_size > 0; buffer_size-- )
 	{
 		if( *src == '#' )
 		{
@@ -163,22 +163,22 @@ int CHudTextMessage::MsgFunc_TextMsg( const char *pszName, int iSize, void *pbuf
 	int msg_dest = READ_BYTE();
 
 	static char szBuf[6][128];
-	char *msg_text = LookupString( READ_STRING(), &msg_dest );
+	const char *msg_text = LookupString( READ_STRING(), &msg_dest );
 	msg_text = strcpy( szBuf[0], msg_text );
 
 	// keep reading strings and using C format strings for subsituting the strings into the localised text string
 	const char *sstr1 = LookupString( READ_STRING() );
 	sstr1 = strcpy( szBuf[1], sstr1 );
-	StripEndNewlineFromString( sstr1 );  // these strings are meant for subsitution into the main strings, so cull the automatic end newlines
+	StripEndNewlineFromString( (char*)sstr1 );  // these strings are meant for subsitution into the main strings, so cull the automatic end newlines
 	const char *sstr2 = LookupString( READ_STRING() );
 	sstr2 = strcpy( szBuf[2], sstr2 );
-	StripEndNewlineFromString( sstr2 );
+	StripEndNewlineFromString( (char*)sstr2 );
 	const char *sstr3 = LookupString( READ_STRING() );
 	sstr3 = strcpy( szBuf[3], sstr3 );
-	StripEndNewlineFromString( sstr3 );
+	StripEndNewlineFromString( (char*)sstr3 );
 	const char *sstr4 = LookupString( READ_STRING() );
 	sstr4 = strcpy( szBuf[4], sstr4 );
-	StripEndNewlineFromString( sstr4 );
+	StripEndNewlineFromString( (char*)sstr4 );
 	char *psz = szBuf[5];
 
 	switch( msg_dest )
diff --git a/dlls/buttons.cpp b/dlls/buttons.cpp
index 76f4ad91..df7c51f3 100644
--- a/dlls/buttons.cpp
+++ b/dlls/buttons.cpp
@@ -525,7 +525,7 @@ void CBaseButton::Spawn()
 // Button sound table. 
 // Also used by CBaseDoor to get 'touched' door lock/unlock sounds
 
-char *ButtonSound( int sound )
+const char *ButtonSound( int sound )
 { 
 	const char *pszSound;
 
diff --git a/dlls/combat.cpp b/dlls/combat.cpp
index d8830c20..35e4ffcf 100644
--- a/dlls/combat.cpp
+++ b/dlls/combat.cpp
@@ -1463,7 +1463,7 @@ void CBaseEntity::FireBullets( ULONG cShots, Vector vecSrc, Vector vecDirShootin
 			}
 		}
 		// make bullet trails
-		UTIL_BubbleTrail( vecSrc, tr.vecEndPos, (int)( ( flDistance * tr.flFraction ) / 64.0 );
+		UTIL_BubbleTrail( vecSrc, tr.vecEndPos, (int)( ( flDistance * tr.flFraction ) / 64.0 ) );
 	}
 	ApplyMultiDamage( pev, pevAttacker );
 }
diff --git a/dlls/weapons.cpp b/dlls/weapons.cpp
index 0b6f7de6..989c32a8 100644
--- a/dlls/weapons.cpp
+++ b/dlls/weapons.cpp
@@ -935,7 +935,7 @@ BOOL CBasePlayerWeapon::CanDeploy( void )
 	return TRUE;
 }
 
-BOOL CBasePlayerWeapon::DefaultDeploy( const char *szViewModel, char *szWeaponModel, int iAnim, char *szAnimExt, int skiplocal /* = 0 */, int body )
+BOOL CBasePlayerWeapon::DefaultDeploy( const char *szViewModel, const char *szWeaponModel, int iAnim, const char *szAnimExt, int skiplocal /* = 0 */, int body )
 {
 	if( !CanDeploy() )
 		return FALSE;
diff --git a/dlls/weapons.h b/dlls/weapons.h
index 8d60bad8..7bb1b486 100644
--- a/dlls/weapons.h
+++ b/dlls/weapons.h
@@ -310,7 +310,7 @@ public:
 
 	virtual BOOL CanDeploy( void );
 	virtual BOOL IsUseable( void );
-	BOOL DefaultDeploy( const char *szViewModel, char *szWeaponModel, int iAnim, char *szAnimExt, int skiplocal = 0, int body = 0 );
+	BOOL DefaultDeploy( const char *szViewModel, const char *szWeaponModel, int iAnim, const char *szAnimExt, int skiplocal = 0, int body = 0 );
 	int DefaultReload( int iClipSize, int iAnim, float fDelay, int body = 0 );
 
 	virtual void ItemPostFrame( void );	// called each frame by the player PostThink
diff --git a/engine/cdll_int.h b/engine/cdll_int.h
index a0dc59c2..056146b4 100644
--- a/engine/cdll_int.h
+++ b/engine/cdll_int.h
@@ -205,7 +205,7 @@ typedef struct cl_enginefuncs_s
 	int	(*CL_CreateVisibleEntity)( int type, struct cl_entity_s *ent );
 
 	const struct model_s* (*GetSpritePointer)( HSPRITE hSprite );
-	void	(*pfnPlaySoundByNameAtLocation)( char *szSound, float volume, float *origin );
+	void	(*pfnPlaySoundByNameAtLocation)( const char *szSound, float volume, float *origin );
 	
 	unsigned short (*pfnPrecacheEvent)( int type, const char* psz );
 	void	(*pfnPlaybackEvent)( 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 );