diff --git a/tools/quake3/common/polylib.c b/tools/quake3/common/polylib.c
index 04881ac1..39f7a149 100644
--- a/tools/quake3/common/polylib.c
+++ b/tools/quake3/common/polylib.c
@@ -409,7 +409,7 @@ winding_t *BaseWindingForPlane( vec3_t normal, vec_t dist ){
    CopyWinding
    ==================
  */
-winding_t   *CopyWinding( winding_t *w ){
+winding_t   *CopyWinding( const winding_t *w ){
 	if ( !w ) {
 		Error( "CopyWinding: winding is NULL" );
 	}
@@ -444,7 +444,7 @@ winding_accu_t *CopyWindingAccuIncreaseSizeAndFreeOld( winding_accu_t *w ){
    CopyWindingAccuToRegular
    ==================
  */
-winding_t   *CopyWindingAccuToRegular( winding_accu_t *w ){
+winding_t   *CopyWindingAccuToRegular( const winding_accu_t *w ){
 	int i;
 	winding_t   *c;
 
diff --git a/tools/quake3/common/polylib.h b/tools/quake3/common/polylib.h
index eb4ce2be..fedbbeb3 100644
--- a/tools/quake3/common/polylib.h
+++ b/tools/quake3/common/polylib.h
@@ -41,7 +41,7 @@ void    ClipWindingEpsilon( winding_t *in, vec3_t normal, vec_t dist,
 void    ClipWindingEpsilonStrict( winding_t *in, vec3_t normal, vec_t dist,
 								  vec_t epsilon, winding_t **front, winding_t **back );
 winding_t   *ChopWinding( winding_t *in, vec3_t normal, vec_t dist );
-winding_t   *CopyWinding( winding_t *w );
+winding_t   *CopyWinding( const winding_t *w );
 winding_t   *ReverseWinding( winding_t *w );
 winding_t   *BaseWindingForPlane( vec3_t normal, vec_t dist );
 void    CheckWinding( winding_t *w );
@@ -72,5 +72,5 @@ typedef struct
 
 winding_accu_t  *BaseWindingForPlaneAccu( vec3_t normal, vec_t dist );
 void    ChopWindingInPlaceAccu( winding_accu_t **w, vec3_t normal, vec_t dist, vec_t epsilon );
-winding_t   *CopyWindingAccuToRegular( winding_accu_t *w );
+winding_t   *CopyWindingAccuToRegular( const winding_accu_t *w );
 void    FreeWindingAccu( winding_accu_t *w );
diff --git a/tools/quake3/q3map2/brush.c b/tools/quake3/q3map2/brush.c
index b71f49ba..a5c948f3 100644
--- a/tools/quake3/q3map2/brush.c
+++ b/tools/quake3/q3map2/brush.c
@@ -150,7 +150,7 @@ void FreeBrushList( brush_t *brushes ){
    duplicates the brush, sides, and windings
  */
 
-brush_t *CopyBrush( brush_t *brush ){
+brush_t *CopyBrush( const brush_t *brush ){
 	/* copy brush */
 	brush_t *newBrush = AllocBrush( brush->numsides );
 	memcpy( newBrush, brush, offsetof( brush_t, sides[brush->numsides] ) );
diff --git a/tools/quake3/q3map2/q3map2.h b/tools/quake3/q3map2/q3map2.h
index fadfefe7..253c883b 100644
--- a/tools/quake3/q3map2/q3map2.h
+++ b/tools/quake3/q3map2/q3map2.h
@@ -1555,7 +1555,7 @@ int                         CountBrushList( brush_t *brushes );
 brush_t                     *AllocBrush( int numsides );
 void                        FreeBrush( brush_t *brushes );
 void                        FreeBrushList( brush_t *brushes );
-brush_t                     *CopyBrush( brush_t *brush );
+brush_t                     *CopyBrush( const brush_t *brush );
 qboolean                    BoundBrush( brush_t *brush );
 qboolean                    CreateBrushWindings( brush_t *brush );
 brush_t                     *BrushFromBounds( vec3_t mins, vec3_t maxs );