diff --git a/counter/models.py b/counter/models.py
index 23ceaaa5..5593c820 100644
--- a/counter/models.py
+++ b/counter/models.py
@@ -1402,9 +1402,9 @@ class InvoiceCall(models.Model):
         verbose_name = _("Invoice call")
         verbose_name_plural = _("Invoice calls")
 
+    def __str__(self):
+        return f"invoice call of {self.month} made by {self.club}"
+
     def save(self, *args, **kwargs):
         self.month = self._meta.get_field("month").to_python(self.month)
         super().save(*args, **kwargs)
-
-    def __str__(self):
-        return f"invoice call of {self.month} made by {self.club}"