diff --git a/core/models.py b/core/models.py
index ea31af0..4bea972 100644
--- a/core/models.py
+++ b/core/models.py
@@ -104,8 +104,9 @@ class EnregistrementRecursif(models.Model):
         ordering = ('jour',)
 
     def is_older(self, month, year):
-        return (self.created_date.month <= month
-                and self.created_date.year <= year)
+        return (self.created_date.year < year 
+		or (self.created_date.month < month
+                    and self.created_date.year == year))
 
     def spawn(self, month, year, commit=True):
         """ Spawn a new Enregistrement for given month and year. """