diff --git a/src/wuttafarm/web/views/users.py b/src/wuttafarm/web/views/users.py
index 2a51399..f35aef7 100644
--- a/src/wuttafarm/web/views/users.py
+++ b/src/wuttafarm/web/views/users.py
@@ -51,12 +51,14 @@ class UserView(base.UserView):
         user = f.model_instance
 
         # farmos_uuid
-        f.fields.append("farmos_uuid")
-        f.set_default("farmos_uuid", user.farmos_uuid)
+        if not self.creating:
+            f.fields.append("farmos_uuid")
+            f.set_default("farmos_uuid", user.farmos_uuid)
 
         # drupal_id
-        f.fields.append("drupal_id")
-        f.set_default("drupal_id", user.drupal_id)
+        if not self.creating:
+            f.fields.append("drupal_id")
+            f.set_default("drupal_id", user.drupal_id)
 
     def get_xref_buttons(self, user):
         buttons = []