diff --git a/mandayejs/mandaye/management/commands/migrate-users.py b/mandayejs/mandaye/management/commands/migrate-users.py
index a9d6d08..5542dec 100644
--- a/mandayejs/mandaye/management/commands/migrate-users.py
+++ b/mandayejs/mandaye/management/commands/migrate-users.py
@@ -74,7 +74,7 @@ class Command(BaseCommand):
         for data in parsed_data:
             try:
                 name_id = force_text(data.get('idpUniqueID'))
-                credentials = json.loads(data.get('spPostValues'))
+                credentials = json.loads(force_text(data.get('spPostValues')))
 
                 user, created = User.objects.get_or_create(
                     username=name_id, last_name=force_text(data.get('spLogin', '')))