diff --git a/engine/common/model.c b/engine/common/model.c
index 6c557bee..851f9dc4 100644
--- a/engine/common/model.c
+++ b/engine/common/model.c
@@ -614,7 +614,7 @@ void GAME_EXPORT Mod_LoadCacheFile( const char *filename, cache_user_t *cu )
 #if XASH_BIG_ENDIAN
 	if( size >= sizeof( int ) && LittleLong( IDSEQGRPHEADER ) == *(uint *)cu->data )
 	{
-		studiohdr_t *phdr = (studiohdr_t *)(intptr_t)REF_GET_PARM( PARM_GET_STUDIO_HDR, 0 );
+		studiohdr_t *phdr = (studiohdr_t *)REF_GET_PARM( PARM_GET_STUDIO_HDR, 0 );
 		if( !phdr )
 			return;
 
diff --git a/engine/ref_api.h b/engine/ref_api.h
index d504faa9..7b9f8253 100644
--- a/engine/ref_api.h
+++ b/engine/ref_api.h
@@ -72,7 +72,8 @@ GNU General Public License for more details.
 //     Moved RenderAPI and TriAPI filling to renderer via R_FillRenderAPI and R_FillTriAPI
 //     Moved detail textures parsing and cinematic texture management to engine
 //     Moved creation of default textures to the engine
-#define REF_API_VERSION 15
+// 16. RefGetParm return type changed from int to intptr_t.
+#define REF_API_VERSION 16
 
 #define TF_SKY		(TF_SKYSIDE|TF_NOMIPMAP|TF_ALLOW_NEAREST)
 #define TF_FONT		(TF_NOMIPMAP|TF_CLAMP|TF_ALLOW_NEAREST)
@@ -599,7 +600,7 @@ typedef struct ref_interface_s
 	void (*CL_DrawBeams)( int fTrans , BEAM *beams );
 
 	// Xash3D Render Interface
-	int			(*RefGetParm)( int parm, int arg );	// generic
+	intptr_t		(*RefGetParm)( int parm, int arg );	// generic
 
 	// detail texture scale
 	void	(*R_GetDetailScaleForTexture)( int texture, float *xScale, float *yScale );
diff --git a/ref/gl/gl_context.c b/ref/gl/gl_context.c
index f436b0e7..038abd41 100644
--- a/ref/gl/gl_context.c
+++ b/ref/gl/gl_context.c
@@ -161,7 +161,7 @@ static qboolean Mod_ProcessRenderData( model_t *mod, qboolean create, const byte
 	return loaded;
 }
 
-static int GL_RefGetParm( int parm, int arg )
+static intptr_t GL_RefGetParm( int parm, int arg )
 {
 	gl_texture_t *glt;
 
diff --git a/ref/null/r_context.c b/ref/null/r_context.c
index e2b537b6..e97214d6 100644
--- a/ref/null/r_context.c
+++ b/ref/null/r_context.c
@@ -224,7 +224,7 @@ static void CL_DrawBeams( int fTrans, BEAM *beams )
 	;
 }
 
-static int RefGetParm( int parm, int arg )
+static intptr_t RefGetParm( int parm, int arg )
 {
 	return 0;
 }
diff --git a/ref/soft/r_context.c b/ref/soft/r_context.c
index c9113d00..1f6c02ae 100644
--- a/ref/soft/r_context.c
+++ b/ref/soft/r_context.c
@@ -120,7 +120,7 @@ static qboolean GAME_EXPORT Mod_ProcessRenderData( model_t *mod, qboolean create
 	return loaded;
 }
 
-static int GL_RefGetParm( int parm, int arg )
+static intptr_t GL_RefGetParm( int parm, int arg )
 {
 	image_t *glt;