diff --git a/session_redis/__init__.py b/session_redis/__init__.py
index af491fc..d3b5bfe 100644
--- a/session_redis/__init__.py
+++ b/session_redis/__init__.py
@@ -2,3 +2,4 @@
 
 from . import http
 from . import session
+from . import models
diff --git a/session_redis/models/__init__.py b/session_redis/models/__init__.py
new file mode 100644
index 0000000..f9b61db
--- /dev/null
+++ b/session_redis/models/__init__.py
@@ -0,0 +1 @@
+from . import user
diff --git a/session_redis/models/user.py b/session_redis/models/user.py
new file mode 100644
index 0000000..e652fd7
--- /dev/null
+++ b/session_redis/models/user.py
@@ -0,0 +1,19 @@
+from openerp import models, tools
+
+
+class User(models.Model):
+    _inherit = 'res.users'
+
+    @tools.ormcache('sid')
+    def _compute_session_token(self, sid):
+        """Make sure to return an unicode string.
+
+        Odoo creates a session token using hexdigest Session which is str
+        but with redis we set the token from a dictionary of values passing
+        it in json format. When dumping values from json, we always get unicode
+        thus both are incompatible.
+
+        The shortest path is to fix the output of the computed session by Odoo.
+
+        """
+        return unicode(super(User, self)._compute_session_token(sid))