diff --git a/speech.py b/speech.py
index 47967ab..418ce0a 100644
--- a/speech.py
+++ b/speech.py
@@ -25,7 +25,7 @@ class Speech:
         return result
 
     @staticmethod
-    def __stt(wav_file: str, server: str) -> str:
+    def __stt(wav_file, server):
         print(f'Connecting to \'{server}\'...')
         request = Request(url=f'{server}/stt',
                           data=Speech.__load_wav(wav_file),
@@ -36,5 +36,5 @@ class Speech:
             raise RuntimeError(f'Wrong reply from server: {result}')
         return result['text'] if not result['code'] else f'Server error: {result}'
 
-    def run(self, wav_file, server):
+    def run(self, wav_file: str, server: str) -> str:
         return self.__stt(wav_file, server)