diff --git a/archivist/apps/importer/models.py b/archivist/apps/importer/models.py
index aa8d316..12933ae 100644
--- a/archivist/apps/importer/models.py
+++ b/archivist/apps/importer/models.py
@@ -15,7 +15,7 @@ class ImportSourceURLs(models.Model):
 
     date_added = models.DateTimeField(auto_now_add=True, editable=True)
     
-    last_imported = models.DateTimeField(editable=True, default=None, null=True) 
+    last_imported = models.DateTimeField(editable=True, blank=True, null=True) 
     
     class Meta:
         verbose_name = _("Import Source URL")