diff --git a/tests/xfs/015 b/tests/xfs/015
index 2c57f788..4939bb92 100755
--- a/tests/xfs/015
+++ b/tests/xfs/015
@@ -66,15 +66,15 @@ _supported_os Linux
 
 _require_scratch
 
-# need 64M space, don't make any assumption
+# need 128M space, don't make any assumption
 _scratch_mkfs >/dev/null 2>&1
 _scratch_mount
-_require_fs_space $SCRATCH_MNT 65536
+_require_fs_space $SCRATCH_MNT 131072
 _scratch_unmount
 
 rm -f $seqres.full
 
-_scratch_mkfs_sized $((16 * 1024 * 1024)) > $tmp.mkfs.raw
+_scratch_mkfs_sized $((32 * 1024 * 1024)) > $tmp.mkfs.raw
 cat $tmp.mkfs.raw | _filter_mkfs >$seqres.full 2>$tmp.mkfs
 # get original data blocks number and agcount
 . $tmp.mkfs