diff --git a/test/shell/vdo-convert.sh b/test/shell/vdo-convert.sh
index cb3dd7100..231939cf4 100644
--- a/test/shell/vdo-convert.sh
+++ b/test/shell/vdo-convert.sh
@@ -61,7 +61,6 @@ aux have_vdo 6 2 5 || skip
 #
 #  In this case we do not need to move any VDO headers.
 #
-if [ 1 -eq 0 ]; then
 vgcreate $vg "$dev1"
 
 lvcreate -L5G -n $lv1 $vg
@@ -139,7 +138,6 @@ lvm_import_vdo --vdo-config "$VDO_CONFIG" -y -v --name $vg1/$lv2 "$dev1"
 fsck -n "$DM_DEV_DIR/$vg1/$lv2"
 
 vgremove -f $vg1
-fi
 
 aux wipefs_a "$dev1"
 
@@ -189,6 +187,8 @@ dmsetup table
 # Get VDO table line
 dmsetup table "$VDONAME" | tr " " "\n" | sed -e '5,6d' -e '12d' | tee vdo-orig
 
+mkfs.ext4 -E nodiscard "$DM_DEV_DIR/mapper/$VDONAME"
+
 # For conversion we
 aux lvmconf 'global/vdo_disabled_features = [ "version4" ]'
 
@@ -209,14 +209,22 @@ unset LVM_VDO_PREPARE
 
 #lvm_import_vdo --no-snapshot --vdo-config "$VDO_CONFIG" -v -y --name $vg/$lv "$TEST"
 lvm_import_vdo --vdo-config "$VDO_CONFIG" --uuid-prefix "$PREFIX" -v -y --name $vg/$lv "$TEST"
+dmsetup table
+
+# check our filesystem is OK
+fsck -n "$DM_DEV_DIR/$vg/$lv"
 
 # Compare converted LV uses same VDO table line
 dmsetup table "$vg-${lv}_vpool-vpool" | tr " " "\n" | sed -e '5,6d' -e '12d' | tee new-vdo-lv
 
+tail -n+3 vdo-orig >vdo-orig-3
+tail -n+3 new-vdo-lv >new-vdo-lv-3
+
 # Check there is a match between VDO and LV managed volume
 # (when differentiating parameters are deleted first)
-diff -u vdo-orig new-vdo-lv || die "Found mismatching VDO table lines!"
+# we need to skip first 2 lines as the device size gets rounded to match VG extent size
+diff -u vdo-orig-3 new-vdo-lv-3 || die "Found mismatching VDO table lines!"
 
-check lv_field $vg/$lv size "<23.00g"
+check lv_field $vg/$lv size "23.00g"
 unset LVM_VDO_PREPARE