diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
index 77302fa..d80926f 100644
--- a/drivers/scsi/st.h
+++ b/drivers/scsi/st.h
@@ -46,6 +46,7 @@
 	struct st_request *last_SRpnt;
 	struct st_cmdstatus cmdstat;
 	struct page **reserved_pages;
+	struct page **mapped_pages;
 	struct rq_map_data map_data;
 	unsigned char *b_data;
 	unsigned short use_sg;	/* zero or max number of s/g segments for this adapter */