diff --git a/utils/normalize.py b/utils/normalize.py
index f447960..cc7cca2 100644
--- a/utils/normalize.py
+++ b/utils/normalize.py
@@ -38,6 +38,7 @@ def normalize(text):
                     .replace('0', 'о')
                     .replace('e', 'е')
                     .replace('d', 'д')
+                    .replace('z', 'з')
                     )
     
     return text
\ No newline at end of file