diff --git a/tests/07testreshape5 b/tests/07testreshape5
index 44d5ddc..0360988 100644
--- a/tests/07testreshape5
+++ b/tests/07testreshape5
@@ -27,6 +27,7 @@ do
 
       # test save
       dd if=/dev/urandom of=$md0 bs=1024 count=$size
+      blockdev --flushbufs $md0 $devs
       > /tmp/NewRand
       $dir/test_stripe save /tmp/NewRand $disks $[chunk*1024] 5 $nlayout 0 $[size*1024] $devs
       cmp -s -n $[size*1024] $md0 /tmp/NewRand || { echo cmp failed ; exit 2; }