diff --git a/auth_session_timeout/models/res_users.py b/auth_session_timeout/models/res_users.py
index c22e17920..1a8c22971 100644
--- a/auth_session_timeout/models/res_users.py
+++ b/auth_session_timeout/models/res_users.py
@@ -102,6 +102,7 @@ class ResUsers(models.Model):
                     'Exception updating session file access/modified times.',
                 )
 
+    @tools.ormcache('sid')
     def _compute_session_token(self, sid):
         res = super(ResUsers, self)._compute_session_token(sid)
         if http.request: