diff --git a/wcsinst/wcsinst/models.py b/wcsinst/wcsinst/models.py
index 6ae9269..fdc45df 100644
--- a/wcsinst/wcsinst/models.py
+++ b/wcsinst/wcsinst/models.py
@@ -9,7 +9,7 @@ logger = logging.getLogger(__name__)
 
 class WcsInstance(models.Model):
     title = models.CharField(max_length=50)
-    domain = models.CharField()
+    domain = models.CharField(max_length=100)
 
     def __unicode__(self):
         return '%s (%s)' % (self.title, self.domain)