diff --git a/sys/dev/vinum/vinuminterrupt.c b/sys/dev/vinum/vinuminterrupt.c
index a09d003d77d8..7344280ae9a5 100644
--- a/sys/dev/vinum/vinuminterrupt.c
+++ b/sys/dev/vinum/vinuminterrupt.c
@@ -396,9 +396,10 @@ complete_raid5_write(struct rqelement *rqe)
 		    rqe->b.b_data = &ubp->b_data[rqe->useroffset << DEV_BSHIFT]; /* point to the user data */
 		    rqe->b.b_bcount = rqe->datalen << DEV_BSHIFT; /* length to write */
 		    rqe->b.b_bufsize = rqe->b.b_bcount;	    /* don't claim more */
-		    rqe->b.b_offset = rqe->b.b_blkno << DEV_BSHIFT;
 		    rqe->b.b_resid = rqe->b.b_bcount;	    /* nothing transferred */
 		    rqe->b.b_blkno += rqe->dataoffset;	    /* point to the correct block */
+		    rqe->b.b_offset = rqe->b.b_blkno << DEV_BSHIFT;
+		    rqe->b.b_iooffset = rqe->b.b_offset;
 		    rqg->active++;			    /* another active request */
 		    drive = &DRIVE[rqe->driveno];	    /* drive to access */
 
@@ -436,6 +437,7 @@ complete_raid5_write(struct rqelement *rqe)
     rqg->flags &= ~XFR_PARITYOP;			    /* reset flags that brought us here */
     rqe->b.b_bcount = rqe->buflen << DEV_BSHIFT;	    /* length to write */
     rqe->b.b_offset = rqe->b.b_blkno << DEV_BSHIFT;
+    rqe->b.b_iooffset = rqe->b.b_offset;
     rqe->b.b_bufsize = rqe->b.b_bcount;			    /* don't claim we have more */
     rqe->b.b_resid = rqe->b.b_bcount;			    /* nothing transferred */
     rqg->active++;					    /* another active request */
diff --git a/sys/dev/vinum/vinumio.c b/sys/dev/vinum/vinumio.c
index 42785dabfc92..ed9dbfb4acd3 100644
--- a/sys/dev/vinum/vinumio.c
+++ b/sys/dev/vinum/vinumio.c
@@ -256,6 +256,7 @@ driveio(struct drive *drive, char *buf, size_t length, off_t offset, int flag)
 	bp->b_dev = drive->dev;				    /* device */
 	bp->b_blkno = offset / drive->sectorsize;	    /* block number */
 	bp->b_offset = offset;
+	bp->b_iooffset = offset;
 	bp->b_saveaddr = bp->b_data;
 	bp->b_data = buf;
 	bp->b_bcount = len;
diff --git a/sys/dev/vinum/vinumrequest.c b/sys/dev/vinum/vinumrequest.c
index 9a0320693a5f..007411aa0459 100644
--- a/sys/dev/vinum/vinumrequest.c
+++ b/sys/dev/vinum/vinumrequest.c
@@ -448,6 +448,7 @@ launch_requests(struct request *rq, int reviveok)
 #endif
 		/* fire off the request */
 		rqe->b.b_offset = rqe->b.b_blkno << DEV_BSHIFT;
+		rqe->b.b_iooffset = rqe->b.b_offset;
 		DEV_STRATEGY(&rqe->b);
 	    }
 	}
@@ -993,6 +994,7 @@ sdio(struct buf *bp)
 	logrq(loginfo_sdiol, (union rqinfou) &sbp->b, &sbp->b);
 #endif
     sbp->b.b_offset = sbp->b.b_blkno << DEV_BSHIFT;
+    sbp->b.b_iooffset = sbp->b.b_offset;
     DEV_STRATEGY(&sbp->b);
     splx(s);
 }