diff --git a/openerp/sql_db.py b/openerp/sql_db.py
index 694ae02b3d9..59841656d8c 100644
--- a/openerp/sql_db.py
+++ b/openerp/sql_db.py
@@ -148,7 +148,7 @@ class Cursor(object):
     def check(f):
         @wraps(f)
         def wrapper(self, *args, **kwargs):
-            if self.__closed:
+            if self._closed:
                 msg = 'Unable to use a closed cursor.'
                 if self.__closer:
                     msg += ' It was closed at %s, line %s' % self.__closer
@@ -165,7 +165,7 @@ class Cursor(object):
         self.sql_log = _logger.isEnabledFor(logging.DEBUG)
 
         self.sql_log_count = 0
-        self.__closed = True    # avoid the call of close() (by __del__) if an exception
+        self._closed = True    # avoid the call of close() (by __del__) if an exception
                                 # is raised by any of the following initialisations
         self._pool = pool
         self.dbname = dbname
@@ -180,7 +180,7 @@ class Cursor(object):
             self.__caller = frame_codeinfo(currentframe(),2)
         else:
             self.__caller = False
-        self.__closed = False   # real initialisation value
+        self._closed = False   # real initialisation value
         self.autocommit(False)
         self.__closer = False
 
@@ -189,7 +189,7 @@ class Cursor(object):
         self.cache = {}
 
     def __del__(self):
-        if not self.__closed and not self._cnx.closed:
+        if not self._closed and not self._cnx.closed:
             # Oops. 'self' has not been closed explicitly.
             # The cursor will be deleted by the garbage collector,
             # but the database connection is not put back into the connection
@@ -302,7 +302,7 @@ class Cursor(object):
         # collected as fast as they should). The problem is probably due in
         # part because browse records keep a reference to the cursor.
         del self._obj
-        self.__closed = True
+        self._closed = True
 
         # Clean the underlying connection.
         self._cnx.rollback()
diff --git a/openerp/tests/common.py b/openerp/tests/common.py
index b0dcac47408..99f5919f2fc 100644
--- a/openerp/tests/common.py
+++ b/openerp/tests/common.py
@@ -15,9 +15,10 @@ import time
 import unittest2
 import urllib2
 import xmlrpclib
-
 from datetime import datetime, timedelta
 
+import werkzeug
+
 import openerp
 
 _logger = logging.getLogger(__name__)
@@ -46,6 +47,8 @@ def acquire_test_cursor(session_id):
         cr = HTTP_SESSION.get(session_id)
         if cr:
             cr._test_lock.acquire()
+            if cr._closed:
+                werkzeug.exceptions.abort(500)
             return cr
 
 def release_test_cursor(cr):