diff --git a/src/transformers/models/blenderbot/tokenization_blenderbot.py b/src/transformers/models/blenderbot/tokenization_blenderbot.py
index 157d495a7af9..ace4afc6d503 100644
--- a/src/transformers/models/blenderbot/tokenization_blenderbot.py
+++ b/src/transformers/models/blenderbot/tokenization_blenderbot.py
@@ -99,8 +99,9 @@ class BlenderbotTokenizer(PreTrainedTokenizer):
     ```
     >>> from transformers import BlenderbotTokenizer
     >>> tokenizer = BlenderbotTokenizer.from_pretrained("facebook/blenderbot-3B")
+    >>> tokenizer.add_prefix_space = False
     >>> tokenizer("Hello world")['input_ids']
-    [6950, 1085, 2]
+    [47, 921, 86, 1085, 2]
     >>> tokenizer(" Hello world")['input_ids']
     [6950, 1085, 2]
     ```