diff --git a/spacy/lang/ru/lemmatizer.py b/spacy/lang/ru/lemmatizer.py
index b78a81f22..1209fd62f 100644
--- a/spacy/lang/ru/lemmatizer.py
+++ b/spacy/lang/ru/lemmatizer.py
@@ -60,9 +60,7 @@ class RussianLemmatizer(Lemmatizer):
         if univ_pos == "PUNCT":
             return [PUNCT_RULES.get(string, string)]
         if univ_pos not in ("ADJ", "DET", "NOUN", "NUM", "PRON", "PROPN", "VERB"):
-            # Skip unchangeable pos
             return self.pymorphy2_lookup_lemmatize(token)
-            return [string.lower()]
         analyses = self._morph.parse(string)
         filtered_analyses = []
         for analysis in analyses: