diff --git a/extensions/api/util.py b/extensions/api/util.py
index 343aa75b..63117aaf 100644
--- a/extensions/api/util.py
+++ b/extensions/api/util.py
@@ -32,7 +32,7 @@ def build_parameters(body):
         'length_penalty': float(body.get('length_penalty', 1)),
         'early_stopping': bool(body.get('early_stopping', False)),
         'seed': int(body.get('seed', -1)),
-        'add_bos_token': int(body.get('add_bos_token', True)),
+        'add_bos_token': bool(body.get('add_bos_token', True)),
         'truncation_length': int(body.get('truncation_length', 2048)),
         'ban_eos_token': bool(body.get('ban_eos_token', False)),
         'skip_special_tokens': bool(body.get('skip_special_tokens', True)),