diff --git a/src/nalodeni/models.py b/src/nalodeni/models.py
index 0d4aebb..a453e7a 100644
--- a/src/nalodeni/models.py
+++ b/src/nalodeni/models.py
@@ -150,7 +150,7 @@ class AppUser(AbstractUser, DataAudited):
     ##
     #   User self-editable fields
     ##
-    postcode = IntegerField(_('PSČ'), blank=True, null=True)
+    postcode = IntegerField(_('PSČ'), blank=False, null=True)
     city = CharField(_(u'Město'), max_length=120, default=None,
                             blank=True, null=True)
     district = IntegerField(_('Kraj'), blank=True, null=True,
diff --git a/src/nalodeni/people.py b/src/nalodeni/people.py
index ae5750c..85c2b9b 100644
--- a/src/nalodeni/people.py
+++ b/src/nalodeni/people.py
@@ -304,11 +304,13 @@ def person_edit(request, id):
     if request.method == "GET":
         form = _form(instance=obj)
         form.fields['email_contact'].disabled = True
+        form.fields['postcode'].required = False
 
     elif request.method == "POST":
         with obj.audit_context(request.user) as ac:
             form = _form(request.POST, instance=obj)
             form.fields['email_contact'].disabled = True
+            form.fields['postcode'].required = False
             if form.is_valid():
                 form.save()
 
diff --git a/src/records_audit/migrations/0004_auto_20190412_0112.py b/src/records_audit/migrations/0004_auto_20190412_0112.py
new file mode 100644
index 0000000..b359519
--- /dev/null
+++ b/src/records_audit/migrations/0004_auto_20190412_0112.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.0.3 on 2019-04-12 01:12
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('records_audit', '0003_auto_20190411_2010'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='auditlog',
+            name='val',
+            field=models.CharField(max_length=500, null=True, verbose_name='Field value'),
+        ),
+    ]
diff --git a/src/records_audit/models.py b/src/records_audit/models.py
index 1c4e60b..f440baf 100644
--- a/src/records_audit/models.py
+++ b/src/records_audit/models.py
@@ -53,7 +53,7 @@ class AuditLog(models.Model):
     rid = models.IntegerField(_('Table record ID'),
         null=False, editable=False)
 
-    val = models.CharField(_('Field value'), max_length=500)
+    val = models.CharField(_('Field value'), max_length=500, null=True)
     """ The latest value is stored in the actual model table. This value
         is the previous one.