diff --git a/backend/genesys_low.h b/backend/genesys_low.h
index c83f91282..3c0ec37f2 100644
--- a/backend/genesys_low.h
+++ b/backend/genesys_low.h
@@ -712,6 +712,10 @@ sanei_genesys_calculate_zmode (Genesys_Device * dev,
 extern SANE_Status
 sanei_genesys_set_buffer_address (Genesys_Device * dev, uint32_t addr);
 
+extern SANE_Status
+sanei_genesys_fe_read_data (Genesys_Device * dev, uint8_t addr,
+			    uint16_t *data);
+
 extern SANE_Status
 sanei_genesys_fe_write_data (Genesys_Device * dev, uint8_t addr,
 			     uint16_t data);