diff --git a/apps/member/models.py b/apps/member/models.py
index 29a387e..05daa22 100644
--- a/apps/member/models.py
+++ b/apps/member/models.py
@@ -51,7 +51,7 @@ class TFJMUser(AbstractUser):
         verbose_name=_("address"),
     )
 
-    postal_code = models.PositiveSmallIntegerField(
+    postal_code = models.PositiveIntegerField(
         null=True,
         default=None,
         verbose_name=_("postal code"),