diff --git a/tests/generic/250 b/tests/generic/250
index a8fd97e3..6b0f7e31 100755
--- a/tests/generic/250
+++ b/tests/generic/250
@@ -54,10 +54,10 @@ _require_no_rtinherit
 
 rm -f $seqres.full
 
-
+fssize=$((100 * 1048576))
 echo "Format and mount"
-$XFS_IO_PROG -d -c "pwrite -S 0x69 -b 1048576 0 $((64 * 1048576))" $SCRATCH_DEV >> $seqres.full
-_scratch_mkfs_sized $((64 * 1048576)) > $seqres.full 2>&1
+$XFS_IO_PROG -d -c "pwrite -S 0x69 -b 1048576 0 $fssize" $SCRATCH_DEV >> $seqres.full
+_scratch_mkfs_sized $fssize > $seqres.full 2>&1
 _dmerror_init
 _dmerror_mount >> $seqres.full 2>&1
 _dmerror_unmount
diff --git a/tests/generic/252 b/tests/generic/252
index b506d599..e102945d 100755
--- a/tests/generic/252
+++ b/tests/generic/252
@@ -56,9 +56,10 @@ AIO_TEST="src/aio-dio-regress/aiocp"
 rm -f $seqres.full
 
 
+fssize=$((100 * 1048576))
 echo "Format and mount"
-$XFS_IO_PROG -d -c "pwrite -S 0x69 -b 1048576 0 $((64 * 1048576))" $SCRATCH_DEV >> $seqres.full
-_scratch_mkfs_sized $((64 * 1048576)) > $seqres.full 2>&1
+$XFS_IO_PROG -d -c "pwrite -S 0x69 -b 1048576 0 $fssize" $SCRATCH_DEV >> $seqres.full
+_scratch_mkfs_sized $fssize > $seqres.full 2>&1
 _dmerror_init
 _dmerror_mount >> $seqres.full 2>&1
 _dmerror_unmount