diff --git a/telebot/types.py b/telebot/types.py
index b793073fd..7f5fc3035 100644
--- a/telebot/types.py
+++ b/telebot/types.py
@@ -7250,7 +7250,7 @@ def _resolve_file(self, file):
             _file = open(file, 'rb')
             return _file, os.path.basename(_file.name)
         elif isinstance(file, IOBase):
-            return file, os.path.basename(file.name)
+            return file, service_utils.generate_random_token()
         elif isinstance(file, Path):
             _file = open(file, 'rb')
             return _file, os.path.basename(_file.name)
@@ -7742,4 +7742,4 @@ def to_dict(self) -> dict:
         return json_dict
     
     def to_json(self) -> str:
-        return json.dumps(self.to_dict())
\ No newline at end of file
+        return json.dumps(self.to_dict())