diff --git a/chapters/en/chapter3/2.mdx b/chapters/en/chapter3/2.mdx
index 232441b84..48d389075 100644
--- a/chapters/en/chapter3/2.mdx
+++ b/chapters/en/chapter3/2.mdx
@@ -120,8 +120,8 @@ from transformers import AutoTokenizer
 
 checkpoint = "bert-base-uncased"
 tokenizer = AutoTokenizer.from_pretrained(checkpoint)
-tokenized_sentences_1 = tokenizer(raw_datasets["train"]["sentence1"])
-tokenized_sentences_2 = tokenizer(raw_datasets["train"]["sentence2"])
+tokenized_sentences_1 = tokenizer(list(raw_datasets["train"]["sentence1"]))
+tokenized_sentences_2 = tokenizer(list(raw_datasets["train"]["sentence2"]))
 ```
 
 > [!TIP]
@@ -180,8 +180,8 @@ Now that we have seen how our tokenizer can deal with one pair of sentences, we
 
 ```py
 tokenized_dataset = tokenizer(
-    raw_datasets["train"]["sentence1"],
-    raw_datasets["train"]["sentence2"],
+    list(raw_datasets["train"]["sentence1"]),
+    list(raw_datasets["train"]["sentence2"]),
     padding=True,
     truncation=True,
 )