diff --git a/sys/dev/ccd/ccd.c b/sys/dev/ccd/ccd.c
index c6eb299612e8..e4faa3f4b8a6 100644
--- a/sys/dev/ccd/ccd.c
+++ b/sys/dev/ccd/ccd.c
@@ -1,4 +1,4 @@
-/* $Id: ccd.c,v 1.51 1999/07/18 14:30:57 phk Exp $ */
+/* $Id: ccd.c,v 1.52 1999/08/14 11:40:34 phk Exp $ */
 
 /*	$NetBSD: ccd.c,v 1.22 1995/12/08 19:13:26 thorpej Exp $	*/
 
@@ -633,6 +633,10 @@ ccdopen(dev, flags, fmt, p)
 	part = ccdpart(dev);
 	pmask = (1 << part);
 
+	dev->si_bsize_phys = DEV_BSIZE;
+	dev->si_bsize_best = BLKDEV_IOSIZE;
+	dev->si_bsize_max = MAXBSIZE;
+
 	/*
 	 * If we're initialized, check to see if there are any other
 	 * open partitions.  If not, then it's safe to update
diff --git a/sys/geom/geom_ccd.c b/sys/geom/geom_ccd.c
index c6eb299612e8..e4faa3f4b8a6 100644
--- a/sys/geom/geom_ccd.c
+++ b/sys/geom/geom_ccd.c
@@ -1,4 +1,4 @@
-/* $Id: ccd.c,v 1.51 1999/07/18 14:30:57 phk Exp $ */
+/* $Id: ccd.c,v 1.52 1999/08/14 11:40:34 phk Exp $ */
 
 /*	$NetBSD: ccd.c,v 1.22 1995/12/08 19:13:26 thorpej Exp $	*/
 
@@ -633,6 +633,10 @@ ccdopen(dev, flags, fmt, p)
 	part = ccdpart(dev);
 	pmask = (1 << part);
 
+	dev->si_bsize_phys = DEV_BSIZE;
+	dev->si_bsize_best = BLKDEV_IOSIZE;
+	dev->si_bsize_max = MAXBSIZE;
+
 	/*
 	 * If we're initialized, check to see if there are any other
 	 * open partitions.  If not, then it's safe to update