diff --git a/demo/hf_based_demo.py b/demo/hf_based_demo.py
index d32c613..8fe8782 100644
--- a/demo/hf_based_demo.py
+++ b/demo/hf_based_demo.py
@@ -60,6 +60,7 @@ def hf_gen(dialog: List, top_p: float, temperature: float, max_dec_len: int):
         top_p=top_p,
         temperature=temperature,
         max_new_tokens=max_dec_len,
+        pad_token_id=tokenizer.eos_token_id,
         streamer=streamer,
     )
     thread = Thread(target=model.generate, kwargs=generation_kwargs)