diff --git a/engine/client/ref_common.c b/engine/client/ref_common.c
index 757573e6..815d7b78 100644
--- a/engine/client/ref_common.c
+++ b/engine/client/ref_common.c
@@ -231,7 +231,7 @@ static ref_api_t gEngfuncs =
 	Cvar_VariableString,
 	Cvar_SetValue,
 	Cvar_Set,
-	(void*)Cvar_RegisterVariable,
+	Cvar_RegisterVariable,
 	Cvar_FullSet,
 
 	Cmd_AddRefCommand,
diff --git a/engine/common/cvar.h b/engine/common/cvar.h
index aea979d3..ff466b20 100644
--- a/engine/common/cvar.h
+++ b/engine/common/cvar.h
@@ -58,6 +58,7 @@ typedef struct convar_s
 
 #define CVAR_TO_BOOL( x )		((x) && ((x)->value != 0.0f) ? true : false )
 
+#ifndef REF_DLL
 cvar_t *Cvar_GetList( void );
 #define Cvar_FindVar( name )	Cvar_FindVarExt( name, 0 )
 convar_t *Cvar_FindVarExt( const char *var_name, int ignore_group );
@@ -81,5 +82,6 @@ qboolean Cvar_CommandWithPrivilegeCheck( convar_t *v, qboolean isPrivileged );
 void Cvar_Init( void );
 void Cvar_PostFSInit( void );
 void Cvar_Unlink( int group );
+#endif // REF_DLL
 
 #endif//CVAR_H
diff --git a/engine/ref_api.h b/engine/ref_api.h
index 18cea090..4c874bce 100644
--- a/engine/ref_api.h
+++ b/engine/ref_api.h
@@ -238,6 +238,7 @@ typedef struct remap_info_s
 	model_t		*model;		// for catch model changes
 } remap_info_t;
 
+typedef struct convar_s convar_t;
 struct con_nprint_s;
 struct engine_studio_api_s;
 struct r_studio_interface_s;
@@ -270,7 +271,7 @@ typedef struct ref_api_s
 	const char *(*pfnGetCvarString)( const char *szName );
 	void        (*Cvar_SetValue)( const char *name, float value );
 	void        (*Cvar_Set)( const char *name, const char *value );
-	void (*Cvar_RegisterVariable)( cvar_t *var );
+	void (*Cvar_RegisterVariable)( convar_t *var );
 	void (*Cvar_FullSet)( const char *var_name, const char *value, int flags );
 
 	// command handlers
@@ -659,6 +660,7 @@ typedef int (*REFAPI)( int version, ref_interface_t *pFunctionTable, ref_api_t*
 	ENGINE_SHARED_CVAR( f, r_sprite_lighting ) \
 	ENGINE_SHARED_CVAR( f, r_drawviewmodel ) \
 	ENGINE_SHARED_CVAR( f, r_glowshellfreq ) \
+	ENGINE_SHARED_CVAR( f, r_lighting_modulate ) \
 
 #define DECLARE_ENGINE_SHARED_CVAR_LIST() \
 	ENGINE_SHARED_CVAR_LIST( DECLARE_ENGINE_SHARED_CVAR )