diff --git a/freqtrade/misc.py b/freqtrade/misc.py
index 05946e008..d01d6a254 100644
--- a/freqtrade/misc.py
+++ b/freqtrade/misc.py
@@ -5,11 +5,11 @@ import gzip
 import logging
 import re
 from datetime import datetime
+from pathlib import Path
 
 import numpy as np
 import rapidjson
 
-
 logger = logging.getLogger(__name__)
 
 
@@ -39,7 +39,7 @@ def datesarray_to_datetimearray(dates: np.ndarray) -> np.ndarray:
     return dates.dt.to_pydatetime()
 
 
-def file_dump_json(filename, data, is_zip=False) -> None:
+def file_dump_json(filename: Path, data, is_zip=False) -> None:
     """
     Dump JSON data into a file
     :param filename: file to create
@@ -49,8 +49,8 @@ def file_dump_json(filename, data, is_zip=False) -> None:
     logger.info(f'dumping json to "{filename}"')
 
     if is_zip:
-        if not filename.endswith('.gz'):
-            filename = filename + '.gz'
+        if filename.suffix != '.gz':
+            filename = filename.with_suffix('.gz')
         with gzip.open(filename, 'w') as fp:
             rapidjson.dump(data, fp, default=str, number_mode=rapidjson.NM_NATIVE)
     else:
diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 252175269..d321affeb 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -190,7 +190,7 @@ class Backtesting(object):
         return tabulate(tabular_data, headers=headers,  # type: ignore
                         floatfmt=floatfmt, tablefmt="pipe")
 
-    def _store_backtest_result(self, recordfilename: str, results: DataFrame,
+    def _store_backtest_result(self, recordfilename: Path, results: DataFrame,
                                strategyname: Optional[str] = None) -> None:
 
         records = [(t.pair, t.profit_percent, t.open_time.timestamp(),
@@ -201,10 +201,10 @@ class Backtesting(object):
         if records:
             if strategyname:
                 # Inject strategyname to filename
-                recname = Path(recordfilename)
-                recordfilename = str(Path.joinpath(
-                    recname.parent, f'{recname.stem}-{strategyname}').with_suffix(recname.suffix))
-            logger.info('Dumping backtest results to %s', recordfilename)
+                recordfilename = Path.joinpath(
+                    recordfilename.parent,
+                    f'{recordfilename.stem}-{strategyname}').with_suffix(recordfilename.suffix)
+            logger.info(f'Dumping backtest results to {recordfilename}')
             file_dump_json(recordfilename, records)
 
     def _get_ticker_list(self, processed) -> Dict[str, DataFrame]:
@@ -458,7 +458,7 @@ class Backtesting(object):
         for strategy, results in all_results.items():
 
             if self.config.get('export', False):
-                self._store_backtest_result(self.config['exportfilename'], results,
+                self._store_backtest_result(Path(self.config['exportfilename']), results,
                                             strategy if len(self.strategylist) > 1 else None)
 
             print(f"Result for strategy {strategy}")
diff --git a/freqtrade/tests/optimize/test_backtesting.py b/freqtrade/tests/optimize/test_backtesting.py
index 9ed7e7296..02e9a9c28 100644
--- a/freqtrade/tests/optimize/test_backtesting.py
+++ b/freqtrade/tests/optimize/test_backtesting.py
@@ -2,6 +2,7 @@
 
 import math
 import random
+from pathlib import Path
 from unittest.mock import MagicMock
 
 import numpy as np
@@ -785,10 +786,10 @@ def test_backtest_record(default_conf, fee, mocker):
     # reset test to test with strategy name
     names = []
     records = []
-    backtesting._store_backtest_result("backtest-result.json", results, "DefStrat")
+    backtesting._store_backtest_result(Path("backtest-result.json"), results, "DefStrat")
     assert len(results) == 4
     # Assert file_dump_json was only called once
-    assert names == ['backtest-result-DefStrat.json']
+    assert names == [Path('backtest-result-DefStrat.json')]
     records = records[0]
     # Ensure records are of correct type
     assert len(records) == 4
diff --git a/freqtrade/tests/test_misc.py b/freqtrade/tests/test_misc.py
index 1a6b2a92d..c55083e64 100644
--- a/freqtrade/tests/test_misc.py
+++ b/freqtrade/tests/test_misc.py
@@ -1,6 +1,7 @@
 # pragma pylint: disable=missing-docstring,C0103
 
 import datetime
+from pathlib import Path
 from unittest.mock import MagicMock
 
 from freqtrade.data.converter import parse_ticker_dataframe
@@ -34,12 +35,12 @@ def test_datesarray_to_datetimearray(ticker_history_list):
 def test_file_dump_json(mocker) -> None:
     file_open = mocker.patch('freqtrade.misc.open', MagicMock())
     json_dump = mocker.patch('rapidjson.dump', MagicMock())
-    file_dump_json('somefile', [1, 2, 3])
+    file_dump_json(Path('somefile'), [1, 2, 3])
     assert file_open.call_count == 1
     assert json_dump.call_count == 1
     file_open = mocker.patch('freqtrade.misc.gzip.open', MagicMock())
     json_dump = mocker.patch('rapidjson.dump', MagicMock())
-    file_dump_json('somefile', [1, 2, 3], True)
+    file_dump_json(Path('somefile'), [1, 2, 3], True)
     assert file_open.call_count == 1
     assert json_dump.call_count == 1