diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index b61049c4e..46c45b5e2 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -735,7 +735,7 @@ class Exchange:
 
     def refresh_latest_ohlcv(self, pair_list: ListPairsWithTimeframes, *,
                              since_ms: Optional[int] = None, cache: bool = True
-                             ) -> Dict[str, DataFrame]:
+                             ) -> Dict[Tuple[str, str], DataFrame]:
         """
         Refresh in-memory OHLCV asynchronously and set `_klines` with the result
         Loops asynchronously over pair_list and downloads all pairs async (semi-parallel).
diff --git a/freqtrade/pairlist/rangestabilityfilter.py b/freqtrade/pairlist/rangestabilityfilter.py
index 8efded9ee..6efe1e2ae 100644
--- a/freqtrade/pairlist/rangestabilityfilter.py
+++ b/freqtrade/pairlist/rangestabilityfilter.py
@@ -1,12 +1,13 @@
 """
 Rate of change pairlist filter
 """
-from copy import deepcopy
 import logging
-from typing import Any, Dict, List
+from copy import deepcopy
+from typing import Any, Dict, List, Optional
 
 import arrow
 from cachetools.ttl import TTLCache
+from pandas import DataFrame
 
 from freqtrade.exceptions import OperationalException
 from freqtrade.misc import plural
@@ -78,7 +79,7 @@ class RangeStabilityFilter(IPairList):
                     pairlist.remove(p)
         return pairlist
 
-    def _validate_pair_loc(self, pair: str, daily_candles: Dict[str, Any]) -> bool:
+    def _validate_pair_loc(self, pair: str, daily_candles: Optional[DataFrame]) -> bool:
         """
         Validate trading range
         :param pair: Pair that's currently validated
diff --git a/tests/strategy/test_interface.py b/tests/strategy/test_interface.py
index 7d6a564b1..640849ba4 100644
--- a/tests/strategy/test_interface.py
+++ b/tests/strategy/test_interface.py
@@ -140,7 +140,8 @@ def test_assert_df(default_conf, mocker, ohlcv_history, caplog):
     with pytest.raises(StrategyError,
                        match=r"Dataframe returned from strategy.*last close price\."):
         _STRATEGY.assert_df(ohlcv_history, len(ohlcv_history),
-                            ohlcv_history.loc[df_len, 'close'] + 0.01, ohlcv_history.loc[df_len, 'date'])
+                            ohlcv_history.loc[df_len, 'close'] + 0.01,
+                            ohlcv_history.loc[df_len, 'date'])
     with pytest.raises(StrategyError,
                        match=r"Dataframe returned from strategy.*last date\."):
         _STRATEGY.assert_df(ohlcv_history, len(ohlcv_history),