diff --git a/combo/data/api.py b/combo/data/api.py
index ecfeb18729d71a6fc56bdc10cff5f2f547396834..b36b6165dc7464d11bbc80228a85659c2f2324af 100644
--- a/combo/data/api.py
+++ b/combo/data/api.py
@@ -86,7 +86,7 @@ def serialize_field(field: Any) -> str:
     return "{}".format(field)
 
 def serialize_token_list(tokenlist: conllu.models.TokenList) -> str:
-    KEYS_ORDER = ['idx', 'text', 'lemma', 'upostag', 'xpostag', 'feats', 'head', 'deprel', 'deps', 'misc']
+    KEYS_ORDER = ['idx', 'text', 'lemma', 'upostag', 'xpostag', 'entity_type', 'feats', 'head', 'deprel', 'deps', 'misc']
     lines = []
 
     if tokenlist.metadata: