diff --git a/telebot/__init__.py b/telebot/__init__.py
index c05c394..43cc05d 100644
--- a/telebot/__init__.py
+++ b/telebot/__init__.py
@@ -94,7 +94,7 @@ class TeleBot:
             if update.update_id > self.last_update_id:
                 self.last_update_id = update.update_id
             new_messages.append(update.message)
-        logger.debug('Received {} new messages'.format(len(new_messages)))
+        logger.debug('Received {0} new messages'.format(len(new_messages)))
         if len(new_messages) > 0:
             self.process_new_messages(new_messages)
 
diff --git a/telebot/apihelper.py b/telebot/apihelper.py
index 62ccfad..d4cb0a1 100644
--- a/telebot/apihelper.py
+++ b/telebot/apihelper.py
@@ -19,9 +19,9 @@ def _make_request(token, method_name, method='get', params=None, files=None):
     :return: The result parsed to a JSON dictionary.
     """
     request_url = telebot.API_URL + 'bot' + token + '/' + method_name
-    logger.debug("Request: method={} url={} params={} files={}".format(method, request_url, params, files))
+    logger.debug("Request: method={0} url={1} params={2} files={3}".format(method, request_url, params, files))
     result = requests.request(method, request_url, params=params, files=files)
-    logger.debug("The server returned: '{}'".format(result.text))
+    logger.debug("The server returned: '{0}'".format(result.text))
     return _check_result(method_name, result)['result']