diff --git a/tests/btrfs/017 b/tests/btrfs/017
index f8855e3d..34c5f0ac 100755
--- a/tests/btrfs/017
+++ b/tests/btrfs/017
@@ -63,13 +63,21 @@ rm -f $seqres.full
 _scratch_mkfs "--nodesize 65536" >>$seqres.full 2>&1
 _scratch_mount
 
-$XFS_IO_PROG -f -d -c "pwrite 0 8K" $SCRATCH_MNT/foo | _filter_xfs_io
+BLOCK_SIZE=$(get_block_size $SCRATCH_MNT)
+EXTENT_SIZE=$((2 * $BLOCK_SIZE))
+
+$XFS_IO_PROG -f -d -c "pwrite 0 $EXTENT_SIZE" $SCRATCH_MNT/foo \
+	| _filter_xfs_io_blocks_modified
 
 _run_btrfs_util_prog subvolume snapshot $SCRATCH_MNT $SCRATCH_MNT/snap
 
-$CLONER_PROG -s 0 -d 0 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/foo-reflink
-$CLONER_PROG -s 0 -d 0 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/snap/foo-reflink
-$CLONER_PROG -s 0 -d 0 -l 8192 $SCRATCH_MNT/foo $SCRATCH_MNT/snap/foo-reflink2
+$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo $SCRATCH_MNT/foo-reflink
+
+$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo \
+	     $SCRATCH_MNT/snap/foo-reflink
+
+$CLONER_PROG -s 0 -d 0 -l $EXTENT_SIZE $SCRATCH_MNT/foo \
+	     $SCRATCH_MNT/snap/foo-reflink2
 
 _run_btrfs_util_prog quota enable $SCRATCH_MNT
 _run_btrfs_util_prog quota rescan -w $SCRATCH_MNT
diff --git a/tests/btrfs/017.out b/tests/btrfs/017.out
index f940f3a6..503eb88b 100644
--- a/tests/btrfs/017.out
+++ b/tests/btrfs/017.out
@@ -1,5 +1,4 @@
 QA output created by 017
-wrote 8192/8192 bytes at offset 0
-XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+Blocks modified: [0 - 1]
 65536 65536
 65536 65536