diff --git a/tests/xfs/139 b/tests/xfs/139
index 2a266352..c074273a 100755
--- a/tests/xfs/139
+++ b/tests/xfs/139
@@ -34,17 +34,20 @@ _require_cp_reflink
 
 rm -f $seqres.full
 
+_scratch_mkfs >/dev/null 2>&1
+_scratch_mount
+blksz=$(_get_file_block_size $SCRATCH_MNT)
+_scratch_unmount
+
 echo "Format and mount"
-_scratch_mkfs -d agsize=$((32 * 1048576)) > $seqres.full 2>&1
+_scratch_mkfs -d agsize=$((8192 * $blksz)) > $seqres.full 2>&1
 _scratch_mount >> $seqres.full 2>&1
 
 testdir=$SCRATCH_MNT/test-$seq
 mkdir $testdir
-blksz="$(_get_block_size $testdir)"
 
 echo "Create the original files"
-sz=$((48 * 1048576))
-nr=$((sz / blksz))
+sz=$((12288 * $blksz))
 _pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full
 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
 _scratch_cycle_mount
@@ -54,8 +57,8 @@ _pwrite_byte 0x62 0 $sz $testdir/file1 >> $seqres.full
 _scratch_cycle_mount
 
 echo "Compare files"
-md5sum $testdir/file1 | _filter_scratch
-md5sum $testdir/file2 | _filter_scratch
+od -t x1 $testdir/file1 | _filter_od
+od -t x1 $testdir/file2 | _filter_od
 #filefrag -v $testdir/file1 $testdir/file2
 
 # success, all done
diff --git a/tests/xfs/139.out b/tests/xfs/139.out
index dc6a31ec..72909bce 100644
--- a/tests/xfs/139.out
+++ b/tests/xfs/139.out
@@ -3,5 +3,9 @@ Format and mount
 Create the original files
 CoW every other block
 Compare files
-673c759fb131ccf3336c4f8c549a497e  SCRATCH_MNT/test-139/file1
-dc802351f6717547cbf4c951b294f952  SCRATCH_MNT/test-139/file2
+0 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62
+*
+30000
+0 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61
+*
+30000