diff --git a/freqtrade/tests/optimize/test_backtesting.py b/freqtrade/tests/optimize/test_backtesting.py
index 20c117a8e..d0c8a88aa 100644
--- a/freqtrade/tests/optimize/test_backtesting.py
+++ b/freqtrade/tests/optimize/test_backtesting.py
@@ -640,12 +640,16 @@ def test_backtest_alternate_buy_sell(default_conf, fee, mocker):
     backtest_conf = _make_backtest_conf(mocker, conf=default_conf, pair='UNITTEST/BTC')
     # We need to enable sell-signal - otherwise it sells on ROI!!
     default_conf['experimental'] = {"use_sell_signal": True}
+    default_conf['ticker_interval'] = '1m'
     backtesting = Backtesting(default_conf)
     backtesting.advise_buy = _trend_alternate  # Override
     backtesting.advise_sell = _trend_alternate  # Override
     results = backtesting.backtest(backtest_conf)
     backtesting._store_backtest_result("test_.json", results)
-    assert len(results) == 21
+    # 200 candles in backtest data
+    # won't buy on first (shifted by 1)
+    # 100 buys signals
+    assert len(results) == 99
     # One trade was force-closed at the end
     assert len(results.loc[results.open_at_end]) == 0