diff --git a/volia/masseffect.py b/volia/masseffect.py
index c1be671..a54e394 100644
--- a/volia/masseffect.py
+++ b/volia/masseffect.py
@@ -92,7 +92,7 @@ def converter(file: str, outtype: str, outfile: str):
                 of.write(f"{kaldi_id} {masseffect_id}\n")
 
 
-def utt2sub(self, file: str, subfile: str, outfile: str):
+def utt2sub(file: str, subfile: str, outfile: str):
     data = core.data.read_id_values(file)
     keys = [key for key in data]
 
@@ -106,7 +106,7 @@ def utt2sub(self, file: str, subfile: str, outfile: str):
             of.write(f"{key} {subkeys_str}")
 
 
-def sub2utt(self, file: str, subfile: str, outfile: str):
+def sub2utt(file: str, subfile: str, outfile: str):
     data = core.data.read_id_values(file)
     keys = [key for key in data]