diff --git a/weboob/tools/capabilities/thumbnail.py b/weboob/tools/capabilities/thumbnail.py
index e260cdd1..757fc721 100644
--- a/weboob/tools/capabilities/thumbnail.py
+++ b/weboob/tools/capabilities/thumbnail.py
@@ -17,7 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from weboob.capabilities.base import CapBaseObject
+from weboob.capabilities.base import CapBaseObject, NotLoaded
 
 class Thumbnail(CapBaseObject):
     def __init__(self, url):
diff --git a/weboob/tools/misc.py b/weboob/tools/misc.py
index 5180aa53..5d56a611 100644
--- a/weboob/tools/misc.py
+++ b/weboob/tools/misc.py
@@ -20,7 +20,6 @@
 
 from dateutil import tz
 from logging import warning
-from random import random
 from time import time, sleep
 from tempfile import gettempdir
 import os