diff --git a/ydb/iam/auth.py b/ydb/iam/auth.py
index 613b92ad..51345240 100644
--- a/ydb/iam/auth.py
+++ b/ydb/iam/auth.py
@@ -101,9 +101,7 @@ def from_file(cls, key_file, iam_endpoint=None, iam_channel_credentials=None):
         with open(os.path.expanduser(key_file), "r") as r:
             key = r.read()
 
-        return BaseJWTCredentials.from_content(
-            cls, key, iam_endpoint=iam_endpoint, iam_channel_credentials=iam_channel_credentials
-        )
+        return cls.from_content(key, iam_endpoint=iam_endpoint, iam_channel_credentials=iam_channel_credentials)
 
     @classmethod
     def from_content(cls, key, iam_endpoint=None, iam_channel_credentials=None):