diff --git a/period.py b/period.py
index c874e44aee..acd6957b9f 100644
--- a/period.py
+++ b/period.py
@@ -72,7 +72,6 @@ class Period(Workflow, ModelSQL, ModelView):
         if grouping == ('product',):
             return pool.get('stock.period.cache')
 
-    @classmethod
     def get_rec_name(self, name):
         return str(self.date)