diff --git a/common/include/3d.h b/common/include/3d.h
index 2cebb6e87..69c4edfdf 100644
--- a/common/include/3d.h
+++ b/common/include/3d.h
@@ -24,13 +24,16 @@ COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
  *
  */
 
-#ifndef _3D_H
-#define _3D_H
+#pragma once
 
+#include <cstdint>
 #include "dxxsconf.h"
 #include "maths.h"
 #include "vecmat.h" //the vector/matrix library
-#include "gr.h"
+
+#include "compiler-array.h"
+
+struct grs_bitmap;
 
 extern int g3d_interp_outline;      //if on, polygon models outlined in white
 
@@ -314,5 +317,3 @@ void g3_set_special_render(tmap_drawer_type tmap_drawer);
 extern tmap_drawer_type tmap_drawer_ptr;
 
 #endif
-
-#endif