diff --git a/src/nlp.py b/src/nlp.py
index c11c951..aeababc 100644
--- a/src/nlp.py
+++ b/src/nlp.py
@@ -20,4 +20,4 @@ class NLP:
             if node.upos != 'NOUN':
                 continue
             nouns.append(node)
-        return list(set([self.lemmatizer(noun.lemma) for noun in nouns]))
+        return list(set([self._lemmatizer(noun.lemma) for noun in nouns]))