diff --git a/pflaenzli/pflaenzli/models.py b/pflaenzli/pflaenzli/models.py
index a4a7266..cc0a54a 100644
--- a/pflaenzli/pflaenzli/models.py
+++ b/pflaenzli/pflaenzli/models.py
@@ -10,7 +10,7 @@ from django.utils.translation import gettext_lazy as _
 
 class PflaenzliUser(AbstractUser):
     email = models.EmailField(max_length=254)
-    zipcode = models.PositiveIntegerField(blank=True, null=True, verbose_name=_('ZIP Code'))
+    zipcode = models.PositiveIntegerField(blank=True, null=True, verbose_name=_('ZIP code'))
 
 
 class Offer(models.Model):
@@ -18,7 +18,7 @@ class Offer(models.Model):
     user = models.ForeignKey(PflaenzliUser, on_delete=models.CASCADE)
     title = models.CharField(max_length=50, verbose_name=_('Title'))
     description = models.TextField(max_length=5000, verbose_name=_('Description'))
-    zipcode = models.IntegerField(blank=True, default=0, verbose_name=_('ZIP Code'))
+    zipcode = models.IntegerField(blank=True, default=0, verbose_name=_('ZIP code'))
     image = models.ImageField(upload_to="uploads/", verbose_name=_('Image'))