diff --git a/src/memory/memory.py b/src/memory/memory.py
index 817809cd..f9d0a324 100644
--- a/src/memory/memory.py
+++ b/src/memory/memory.py
@@ -40,12 +40,14 @@ class Sessions(object):
     """Sessions are data associated to key used for a temporary moment, with optional profile checking."""
     DEFAULT_TIMEOUT = 600
 
-    def __init__(self, timeout=None):
+    def __init__(self, timeout=None, resettable_timeout=True):
         """
-        @param timeout: nb of seconds before session destruction
+        @param timeout (int): nb of seconds before session destruction
+        @param resettable_timeout (bool): if True, the timeout is reset on each access
         """
         self._sessions = dict()
         self.timeout = timeout or Sessions.DEFAULT_TIMEOUT
+        self.resettable_timeout = resettable_timeout
 
     def newSession(self, session_data=None, session_id=None, profile=None):
         """ Create a new session
@@ -83,7 +85,8 @@ class Sessions(object):
             raise exceptions.InternalError("You need to use __getitem__ when profile is not set")
         if profile_set != profile:
             raise exceptions.InternalError("current profile differ from set profile !")
-        timer.reset(self.timeout)
+        if self.resettable_timeout:
+            timer.reset(self.timeout)
         return session_data
 
     def __getitem__(self, session_id):
@@ -91,7 +94,8 @@ class Sessions(object):
             timer, session_data = self._sessions[session_id]
         except ValueError:
             raise exceptions.InternalError("You need to use profileGet instead of __getitem__ when profile is set")
-        timer.reset(self.timeout)
+        if self.resettable_timeout:
+            timer.reset(self.timeout)
         return session_data
 
     def __setitem__(self, key, value):
@@ -146,7 +150,7 @@ class ProfileSessions(Sessions):
         ids = self._profileGetAllIds(profile)
         if len(ids) > 1:
             raise exceptions.InternalError('profileGetUnique has been used but more than one session has been found!')
-        return self.profileGet(ids[0], profile) if len(ids) == 1 else None
+        return self.profileGet(ids[0], profile) if len(ids) == 1 else None  # XXX: timeout might be reset
 
 
     def profileDelUnique(self, profile):