diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index f57380a..a4345ef 100644
--- a/src/backend/utils/adt/geo_ops.c
+++ b/src/backend/utils/adt/geo_ops.c
@@ -41,7 +41,6 @@ enum path_delim
 static int	point_inside(Point *p, int npts, Point *plist);
 static int	lseg_crossing(double x, double y, double px, double py);
 static BOX *box_construct(double x1, double x2, double y1, double y2);
-static BOX *box_fill(BOX *result, double x1, double x2, double y1, double y2);
 static bool box_ov(BOX *box1, BOX *box2);
 static double box_ht(BOX *box);
 static double box_wd(BOX *box);
@@ -451,7 +450,7 @@ box_construct(double x1, double x2, double y1, double y2)
 
 /*		box_fill		-		fill in a given box struct
  */
-static BOX *
+BOX *
 box_fill(BOX *result, double x1, double x2, double y1, double y2)
 {
 	if (x1 > x2)
@@ -482,7 +481,7 @@ box_fill(BOX *result, double x1, double x2, double y1, double y2)
 /*		box_copy		-		copy a box
  */
 BOX *
-box_copy(BOX *box)
+box_copy(const BOX *box)
 {
 	BOX		   *result = (BOX *) palloc(sizeof(BOX));
 
diff --git a/src/include/utils/geo_decls.h b/src/include/utils/geo_decls.h
index a589e42..94806c2 100644
--- a/src/include/utils/geo_decls.h
+++ b/src/include/utils/geo_decls.h
@@ -182,6 +182,7 @@ typedef struct
 extern double point_dt(Point *pt1, Point *pt2);
 extern double point_sl(Point *pt1, Point *pt2);
 extern double pg_hypot(double x, double y);
-extern BOX *box_copy(BOX *box);
+extern BOX *box_copy(const BOX *box);
+extern BOX *box_fill(BOX *box, double xlo, double xhi, double ylo, double yhi);
 
 #endif							/* GEO_DECLS_H */