Index: obj_arc_ui.c
===================================================================
--- obj_arc_ui.c	(revision 5336)
+++ obj_arc_ui.c	(revision 5337)
@@ -131,13 +131,9 @@
 {
 	pcb_arc_t *arc = Ptr2;
 	int *end_pt = Ptr3;
-	pcb_box_t *ends = pcb_arc_get_ends(arc);
-
-	if (end_pt == NULL)
-		*res = pcb_point_box(ends->X1, ends->Y1);
-	else
-		*res = pcb_point_box(ends->X2, ends->Y2);
-
+	pcb_coord_t ex, ey;
+	pcb_arc_get_end(arc, (end_pt != pcb_arc_start_ptr), &ex, &ey);
+	*res = pcb_point_box(ex, ey);
 	return 0;
 }