Index: gtkhid-cairo.c
===================================================================
--- gtkhid-cairo.c	(revision 17222)
+++ gtkhid-cairo.c	(revision 17223)
@@ -565,6 +565,7 @@
 
 static void ghid_cairo_render_burst(pcb_burst_op_t op, const pcb_box_t *screen)
 {
+	pcb_gui->coord_per_pix = ghid_port.coord_per_pix;
 }
 
 /* Drawing modes usually cycle from RESET to (POSITIVE | NEGATIVE) to FLUSH. screen is not used in this HID. */