diff --git a/labs02/task03.py b/labs02/task03.py
index b5e2e5f..08c374c 100644
--- a/labs02/task03.py
+++ b/labs02/task03.py
@@ -17,7 +17,7 @@ def oov(text, vocab):
     text_splitted = text.split(' ')
     for word in text_splitted:
         if word.lower() not in vocab:
-            list_of_words.append(word)
+            list_of_words.append(word.lower())
     return set(list_of_words)