diff --git a/examples/seq2seq/run_seq2seq.py b/examples/seq2seq/run_seq2seq.py
index db278073627..7450b652c28 100755
--- a/examples/seq2seq/run_seq2seq.py
+++ b/examples/seq2seq/run_seq2seq.py
@@ -52,7 +52,7 @@ logger = logging.getLogger(__name__)
 
 try:
     nltk.data.find("tokenizers/punkt")
-except LookupError:
+except (LookupError, OSError):
     if is_offline_mode():
         raise LookupError(
             "Offline mode: run this script without TRANSFORMERS_OFFLINE first to download nltk data files"