diff --git a/addons/report_webkit/webkit_report.py b/addons/report_webkit/webkit_report.py
index e6ed123b8ad..cccaec76bc3 100644
--- a/addons/report_webkit/webkit_report.py
+++ b/addons/report_webkit/webkit_report.py
@@ -37,6 +37,7 @@ from openerp import report
 import tempfile
 import time
 import logging
+from functools import partial
 
 from mako.template import Template
 from mako.lookup import TemplateLookup
@@ -68,7 +69,6 @@ class WebKitParser(report_sxw):
     """
     def __init__(self, name, table, rml=False, parser=False,
         header=True, store=False):
-        self.parser_instance = False
         self.localcontext = {}
         report_sxw.__init__(self, name, table, rml, parser,
             header, store)
@@ -179,16 +179,16 @@ class WebKitParser(report_sxw):
                     _logger.error('cannot remove file %s: %s', f_to_del, exc)
         return pdf
 
-    def translate_call(self, src):
+    def translate_call(self, parser_instance, src):
         """Translate String."""
-        ir_translation = self.pool.get('ir.translation')
+        ir_translation = self.pool['ir.translation']
         name = self.tmpl and 'addons/' + self.tmpl or None
-        res = ir_translation._get_source(self.parser_instance.cr, self.parser_instance.uid,
-                                         name, 'report', self.parser_instance.localcontext.get('lang', 'en_US'), src)
+        res = ir_translation._get_source(parser_instance.cr, parser_instance.uid,
+                                         name, 'report', parser_instance.localcontext.get('lang', 'en_US'), src)
         if res == src:
             # no translation defined, fallback on None (backward compatibility)
-            res = ir_translation._get_source(self.parser_instance.cr, self.parser_instance.uid,
-                                             None, 'report', self.parser_instance.localcontext.get('lang', 'en_US'), src)
+            res = ir_translation._get_source(parser_instance.cr, parser_instance.uid,
+                                             None, 'report', parser_instance.localcontext.get('lang', 'en_US'), src)
         if not res :
             return src
         return res
@@ -203,14 +203,14 @@ class WebKitParser(report_sxw):
         if report_xml.report_type != 'webkit':
             return super(WebKitParser,self).create_single_pdf(cursor, uid, ids, data, report_xml, context=context)
 
-        self.parser_instance = self.parser(cursor,
-                                           uid,
-                                           self.name2,
-                                           context=context)
+        parser_instance = self.parser(cursor,
+                                      uid,
+                                      self.name2,
+                                      context=context)
 
         self.pool = pooler.get_pool(cursor.dbname)
         objs = self.getObjects(cursor, uid, ids, context)
-        self.parser_instance.set_context(objs, data, ids, report_xml.report_type)
+        parser_instance.set_context(objs, data, ids, report_xml.report_type)
 
         template =  False
 
@@ -240,17 +240,18 @@ class WebKitParser(report_sxw):
         if not css :
             css = ''
 
+        translate_call = partial(self.translate_call, parser_instance)
         #default_filters=['unicode', 'entity'] can be used to set global filter
         body_mako_tpl = mako_template(template)
         helper = WebKitHelper(cursor, uid, report_xml.id, context)
         if report_xml.precise_mode:
             for obj in objs:
-                self.parser_instance.localcontext['objects'] = [obj]
+                parser_instance.localcontext['objects'] = [obj]
                 try :
                     html = body_mako_tpl.render(helper=helper,
                                                 css=css,
-                                                _=self.translate_call,
-                                                **self.parser_instance.localcontext)
+                                                _=translate_call,
+                                                **parser_instance.localcontext)
                     htmls.append(html)
                 except Exception:
                     msg = exceptions.text_error_template().render()
@@ -260,8 +261,8 @@ class WebKitParser(report_sxw):
             try :
                 html = body_mako_tpl.render(helper=helper,
                                             css=css,
-                                            _=self.translate_call,
-                                            **self.parser_instance.localcontext)
+                                            _=translate_call,
+                                            **parser_instance.localcontext)
                 htmls.append(html)
             except Exception:
                 msg = exceptions.text_error_template().render()
@@ -271,9 +272,9 @@ class WebKitParser(report_sxw):
         try :
             head = head_mako_tpl.render(helper=helper,
                                         css=css,
-                                        _=self.translate_call,
+                                        _=translate_call,
                                         _debug=False,
-                                        **self.parser_instance.localcontext)
+                                        **parser_instance.localcontext)
         except Exception:
             raise except_osv(_('Webkit render!'),
                 exceptions.text_error_template().render())
@@ -283,8 +284,8 @@ class WebKitParser(report_sxw):
             try :
                 foot = foot_mako_tpl.render(helper=helper,
                                             css=css,
-                                            _=self.translate_call,
-                                            **self.parser_instance.localcontext)
+                                            _=translate_call,
+                                            **parser_instance.localcontext)
             except:
                 msg = exceptions.text_error_template().render()
                 _logger.error(msg)
@@ -294,8 +295,8 @@ class WebKitParser(report_sxw):
                 deb = head_mako_tpl.render(helper=helper,
                                            css=css,
                                            _debug=tools.ustr("\n".join(htmls)),
-                                           _=self.translate_call,
-                                           **self.parser_instance.localcontext)
+                                           _=translate_call,
+                                           **parser_instance.localcontext)
             except Exception:
                 msg = exceptions.text_error_template().render()
                 _logger.error(msg)