diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index 734481ce..a8270aaf 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -1281,7 +1281,7 @@ class TelegramClient(TelegramBareClient):
 
     def send_voice_note(self, *args, **kwargs):
         """Wrapper method around .send_file() with is_voice_note=True"""
-        kwargs["is_voice_note"] = True
+        kwargs['is_voice_note'] = True
         return self.send_file(*args, **kwargs)
 
     def _send_album(self, entity, files, caption=None,