diff --git a/cli/fileformat.py b/cli/fileformat.py
index 74e3b47..adfd0bb 100644
--- a/cli/fileformat.py
+++ b/cli/fileformat.py
@@ -13,7 +13,7 @@ fields = {
          ('series', 's'), ('description', 's'), # TODO picture, thumbnail
          ('references', 'd')],
     'person':
-        [('id', 's'), ('first_name', 's'), ('last_name', 's')],
+        [('id', 's'), ('firstname', 's'), ('lastname', 's')],
     'category':
         [('id', 's'), ('name', 's'), ('placement', 'l')] }
 
@@ -34,7 +34,7 @@ action_fields = {
           'required': ['isbn'] },
     'new-person':
         { 'type': 'person',
-          'required': ['id', 'first_name', 'last_name'] },
+          'required': ['id', 'firstname', 'lastname'] },
     'edit-person':
         { 'type': 'person',
           'required': ['id'] },