diff --git a/sat/core/core_types.py b/sat/core/core_types.py
index 27d5872d..08aa7bf5 100644
--- a/sat/core/core_types.py
+++ b/sat/core/core_types.py
@@ -16,6 +16,9 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from twisted.words.protocols.jabber import jid as t_jid
+
 
 class SatXMPPEntity:
-    pass
+
+    jid: t_jid.JID