diff --git a/libburn/sg-freebsd.c b/libburn/sg-freebsd.c
index 74a5f85..fcdf43f 100644
--- a/libburn/sg-freebsd.c
+++ b/libburn/sg-freebsd.c
@@ -481,6 +481,7 @@ static void enumerate_common(char *fname, int bus_no, int host_no,
 	out.get_nwa = mmc_get_nwa;
 	out.close_disc = mmc_close_disc;
 	out.close_session = mmc_close_session;
+	out.read_buffer_capacity = mmc_read_buffer_capacity;
 	out.idata = malloc(sizeof(struct burn_scsi_inquiry_data));
 	out.idata->valid = 0;
 	out.mdata = malloc(sizeof(struct scsi_mode_data));