diff --git a/tests/xfs/140 b/tests/xfs/140
index c06a722a..7385dc42 100755
--- a/tests/xfs/140
+++ b/tests/xfs/140
@@ -39,16 +39,21 @@ _scratch_mount
 blksz=$(_get_file_block_size $SCRATCH_MNT)
 _scratch_unmount
 
+agsize=$((8192 * $blksz))
+if [[ $agsize -lt $((16 * 1024 * 1024)) ]]; then
+	agsize=$((16 * 1024 * 1024))
+fi
+sz=$((4096 * $blksz + $agsize))
+nr=$(($sz / $blksz))
+
 echo "Format and mount"
-_scratch_mkfs -d agsize=$((8192 * $blksz)) > $seqres.full 2>&1
+_scratch_mkfs -d agsize=$agsize > $seqres.full 2>&1
 _scratch_mount >> $seqres.full 2>&1
 
 testdir=$SCRATCH_MNT/test-$seq
 mkdir $testdir
 
 echo "Create the original files"
-nr=12288
-sz=$(($nr * $blksz))
 _pwrite_byte 0x61 0 $sz $testdir/file1 >> $seqres.full
 _cp_reflink $testdir/file1 $testdir/file2 >> $seqres.full
 _pwrite_byte 0x61 0 $sz $testdir/file2.chk >> $seqres.full