diff --git a/interfaces.py b/interfaces.py
index a8d4966..f20f4e9 100644
--- a/interfaces.py
+++ b/interfaces.py
@@ -745,13 +745,16 @@ class IExternalFile(IFile):
                 missing_value='',
                 required=False)
 
-    externalAddress = schema.BytesLine(
-                title=_(u'External Address'),
-                description=_(u'The full address for accessing the object '
-                        'on the external storage, e.g. a filename or path.'),
-                default='',
-                missing_value='',
-                required=False)
+    #externalAddress = schema.BytesLine(
+    #            title=_(u'External Address'),
+    #            description=_(u'The full address for accessing the object '
+    #                    'on the external storage, e.g. a filename or path.'),
+    #            default='',
+    #            missing_value='',
+    #            required=False)
+
+    externalAddress = Attribute('The full address for accessing the object '
+                        'on the external storage, e.g. a filename or path.')
 
 
 class IImage(IResourceAdapter):