diff --git a/freqtrade/optimize/__init__.py b/freqtrade/optimize/__init__.py
index a26744691..61694d884 100644
--- a/freqtrade/optimize/__init__.py
+++ b/freqtrade/optimize/__init__.py
@@ -35,7 +35,7 @@ def load_tickerdata_file(
     """
     path = make_testdata_path(datadir)
     file = os.path.join(path, '{pair}-{ticker_interval}.json'.format(
-        pair=pair,
+        pair=pair.replace('/', '_'),
         ticker_interval=ticker_interval,
     ))
     gzipfile = file + '.gz'
@@ -126,7 +126,7 @@ def download_backtesting_testdata(datadir: str, pair: str, interval: int = 5) ->
         interval
     )
 
-    filepair = pair.replace("-", "_")
+    filepair = pair.replace("/", "_")
     filename = os.path.join(path, '{pair}-{interval}.json'.format(
         pair=filepair,
         interval=interval,
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 6202edead..2b583da3c 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -53,7 +53,10 @@ class Backtesting(object):
         self.tickerdata_to_dataframe = self.analyze.tickerdata_to_dataframe
         self.populate_buy_trend = self.analyze.populate_buy_trend
         self.populate_sell_trend = self.analyze.populate_sell_trend
-        exchange.init({'key': '', 'secret': ''})
+        # Reest keys for backtesting
+        self.config['exchange']['key'] = ''
+        self.config['exchange']['secret'] = ''
+        exchange.init(self.config)
 
     @staticmethod
     def get_timeframe(data: Dict[str, DataFrame]) -> Tuple[arrow.Arrow, arrow.Arrow]: