Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 13214)
+++ trunk/src/obj_subc.c	(revision 13215)
@@ -1445,7 +1445,7 @@
 	return PCB_R_DIR_FOUND_CONTINUE;
 }
 
-void pcb_subc_draw_preview(const pcb_subc_t *sc, pcb_box_t *drawn_area)
+void pcb_subc_draw_preview(const pcb_subc_t *sc, const pcb_box_t *drawn_area)
 {
 	int n;
 	pcb_pstk_draw_t ctx;
Index: trunk/src/obj_subc.h
===================================================================
--- trunk/src/obj_subc.h	(revision 13214)
+++ trunk/src/obj_subc.h	(revision 13215)
@@ -74,7 +74,7 @@
 pcb_bool pcb_selected_subc_change_side(void);
 
 /* Draw a subcircuit for a preview (silk, copper and outline only) */
-void pcb_subc_draw_preview(const pcb_subc_t *sc, pcb_box_t *drawn_area);
+void pcb_subc_draw_preview(const pcb_subc_t *sc, const pcb_box_t *drawn_area);
 
 void XORDrawSubc(pcb_subc_t *sc, pcb_coord_t DX, pcb_coord_t DY);