diff --git a/libvo/vo_bl.c b/libvo/vo_bl.c
index e2f857eca1..8c37139ec8 100644
--- a/libvo/vo_bl.c
+++ b/libvo/vo_bl.c
@@ -422,7 +422,7 @@ static int preinit(const char *arg) {
 					bl_hosts[no_bl_hosts].port);
 			no_bl_hosts++;
 		} else {
-			mp_msg(MSGT_VO, MSGL_ERR, "bl: syntax error in entry %d in subdevice %s, should be a comma separated\nlist of host=name:port and file=foo.bml\n", no_bl_hosts, no_bl_files, arg);
+			mp_msg(MSGT_VO, MSGL_ERR, "bl: syntax error in entry %d in subdevice %s, should be a comma separated\nlist of host=name:port and file=foo.bml\n", no_bl_hosts + no_bl_files, arg);
 			return 1;
 		}
 		p = ++q;