diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 3627a07e4..3958f6838 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -86,7 +86,7 @@ class Exchange:
         self._last_markets_refresh: int = 0
 
         # Cache for 10 minutes ...
-        self._fetch_tickers_cache = TTLCache(maxsize=1, ttl=60 * 10)
+        self._fetch_tickers_cache: TTLCache = TTLCache(maxsize=1, ttl=60 * 10)
 
         # Holds candles
         self._klines: Dict[Tuple[str, str], DataFrame] = {}
diff --git a/tests/rpc/test_rpc.py b/tests/rpc/test_rpc.py
index a548505a7..63e09cbe1 100644
--- a/tests/rpc/test_rpc.py
+++ b/tests/rpc/test_rpc.py
@@ -570,7 +570,7 @@ def test_rpc_balance_handle(default_conf, mocker, tickers):
     assert prec_satoshi(result['total'], 12.309096315)
     assert prec_satoshi(result['value'], 184636.44472997)
     assert tickers.call_count == 1
-    assert tickers.call_args[1]['cached'] is True
+    assert tickers.call_args_list[0][1]['cached'] is True
     assert 'USD' == result['symbol']
     assert result['currencies'] == [
         {'currency': 'BTC',