diff --git a/ietf/doc/migrations/0035_auto_20171029_1414.py b/ietf/doc/migrations/0035_auto_20171029_1414.py
new file mode 100644
index 000000000..b369682c0
--- /dev/null
+++ b/ietf/doc/migrations/0035_auto_20171029_1414.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.10.8 on 2017-10-29 14:14
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('doc', '0034_documenturl'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='documenturl',
+            name='url',
+            field=models.URLField(max_length=512),
+        ),
+    ]
diff --git a/ietf/doc/models.py b/ietf/doc/models.py
index 26d64659d..2e5544e13 100644
--- a/ietf/doc/models.py
+++ b/ietf/doc/models.py
@@ -787,7 +787,7 @@ class DocumentURL(models.Model):
     doc  = models.ForeignKey(Document)
     tag  = models.ForeignKey(DocUrlTagName)
     desc = models.CharField(max_length=255, default='', blank=True)
-    url  = models.URLField()
+    url  = models.URLField(max_length=512)
 
 class RelatedDocHistory(models.Model):
     source = models.ForeignKey('DocHistory')