diff --git a/freqtrade/exchange/binance.py b/freqtrade/exchange/binance.py
index 8dced3894..06d64999d 100644
--- a/freqtrade/exchange/binance.py
+++ b/freqtrade/exchange/binance.py
@@ -93,7 +93,7 @@ class Binance(Exchange):
             raise OperationalException(e) from e
 
     async def _async_get_historic_ohlcv(self, pair: str, timeframe: str,
-                                        since_ms: int, is_new_pair: bool
+                                        since_ms: int, is_new_pair: bool = False
                                         ) -> List:
         """
         Overwrite to introduce "fast new pair" functionality by detecting the pair's listing date
diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index f9553699b..b22556f60 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -1223,8 +1223,8 @@ class Exchange:
                                   drop_incomplete=self._ohlcv_partial_candle)
 
     async def _async_get_historic_ohlcv(self, pair: str, timeframe: str,
-                                        since_ms: int, is_new_pair: bool
-                                        ) -> List:
+                                        since_ms: int, is_new_pair: bool = False
+                                        ) -> Tuple[str, str, List]:
         """
         Download historic ohlcv
         :param is_new_pair: used by binance subclass to allow "fast" new pair downloading