Index: obj_arc_ui.c
===================================================================
--- obj_arc_ui.c	(revision 31019)
+++ obj_arc_ui.c	(revision 31020)
@@ -37,7 +37,7 @@
 
 static void draw_mark(rnd_hid_gc_t gc, const pcb_arc_t *arc)
 {
-	const rnd_coord_t mark = PCB_MM_TO_COORD(0.2);
+	const rnd_coord_t mark = RND_MM_TO_COORD(0.2);
 	rnd_render->draw_line(gc, arc->X-mark, arc->Y, arc->X+mark, arc->Y);
 	rnd_render->draw_line(gc, arc->X, arc->Y-mark, arc->X, arc->Y+mark);
 }