diff --git a/test/shell/lvconvert-thin.sh b/test/shell/lvconvert-thin.sh
index c08b95a0d..992a1f261 100644
--- a/test/shell/lvconvert-thin.sh
+++ b/test/shell/lvconvert-thin.sh
@@ -135,7 +135,7 @@ lvremove -f $vg
 if test "$TSIZE" = 64T; then
 lvcreate -L24T -n $lv1 $vg
 # Warning about bigger then needed (24T data and 16G -> 128K chunk)
-lvconvert --yes -c 64 --thinpool $vg/$lv1 2>&1 | tee err
+fail lvconvert --yes -c 64 --thinpool $vg/$lv1 2>&1 | tee err
 grep "WARNING: Chunk size is too small" err
 lvremove -f $vg
 fi
diff --git a/test/shell/lvcreate-thin-big.sh b/test/shell/lvcreate-thin-big.sh
index da7812f4a..9c84288c2 100644
--- a/test/shell/lvcreate-thin-big.sh
+++ b/test/shell/lvcreate-thin-big.sh
@@ -36,7 +36,7 @@ grep "WARNING: Minimum" out
 lvcreate -L4M --chunksize 64k --poolmetadatasize 17G -T $vg/pool2 2>out
 grep "WARNING: Maximum" out
 check lv_field $vg/pool1_tmeta size "2.00m"
-check lv_field $vg/pool2_tmeta size "16.00g"
+check lv_field $vg/pool2_tmeta size "15.81g"
 
 # Check can start and see thinpool with metadata size above kernel limit
 lvcreate -L4M --poolmetadatasize 16G -T $vg/poolM