--- a/scan/sane/ledmi.h
+++ b/scan/sane/ledmi.h
@@ -162,7 +162,7 @@ struct ledm_session
 int bb_open(struct ledm_session*);
 int bb_close(struct ledm_session*);
 int bb_get_parameters(struct ledm_session*, SANE_Parameters*, int);
-int bb_is_paper_in_adf();         /* 0 = no paper in adf, 1 = paper in adf, -1 = error */
+int bb_is_paper_in_adf(struct ledm_session*);         /* 0 = no paper in adf, 1 = paper in adf, -1 = error */
 SANE_Status bb_start_scan(struct ledm_session*);
 int bb_get_image_data(struct ledm_session*, int); 
 int bb_end_page(struct ledm_session*, int);
