diff --git a/addons/project/project.py b/addons/project/project.py
index 67767a5ad64..9966ad02ee8 100644
--- a/addons/project/project.py
+++ b/addons/project/project.py
@@ -252,14 +252,16 @@ class project(osv.osv):
             self.log(cr, uid, id, message)
         return res
     
-    def map_tasks(self,cr,uid,project_id,new_id,context=None):
-         #copy all the task manually
-        task_obj = self.pool.get('project.task')
-        proj = self.browse(cr, uid, project_id, context=context)
+    def map_tasks(self, cr, uid, old_project_id, new_project_id, context=None):
+        """ copy and map tasks from old to new project """
+        if context is None:
+            context = {}
         map_task_id = {}
+        task_obj = self.pool.get('project.task')
+        proj = self.browse(cr, uid, old_project_id, context=context)
         for task in proj.tasks:
             map_task_id[task.id] =  task_obj.copy(cr, uid, task.id, {}, context=context)
-        self.write(cr, uid, new_id, {'tasks':[(6,0, map_task_id.values())]})
+        self.write(cr, uid, new_project_id, {'tasks':[(6,0, map_task_id.values())]})
         task_obj.duplicate_task(cr, uid, map_task_id, context=context)
         return True