diff --git a/ir.py b/ir.py
index da8e780..c300fe7 100644
--- a/ir.py
+++ b/ir.py
@@ -53,7 +53,7 @@ class Sequence(metaclass=PoolMeta):
                             'ir_sequence_period.msg_missing_date',
                             date=date,
                             sequence=sequence.rec_name))
-                return super(Sequence, cls).get(_lock=_lock)
+                return super().get(_lock=_lock)
         return ''
 
     def _get_period_pattern(self):