diff --git a/src/datumaro/plugins/transforms.py b/src/datumaro/plugins/transforms.py
index 3a22ffb36e..4b13f40580 100644
--- a/src/datumaro/plugins/transforms.py
+++ b/src/datumaro/plugins/transforms.py
@@ -662,8 +662,8 @@ def _add_unique_suffix(self, name):
         count = 0
         while name in self._names:
             suffix = "".join(
-                random.choices(self.SUFFIX_LETTERS, k=self._suffix_length)
-            )  # nosec B311
+                random.choices(self.SUFFIX_LETTERS, k=self._suffix_length)  # nosec B311
+            )
             new_name = f"{name}__{suffix}"
             if new_name not in self._names:
                 name = new_name