diff --git a/freqtrade/optimize/backtesting.py b/freqtrade/optimize/backtesting.py
index 429633f31..dcccd36a3 100644
--- a/freqtrade/optimize/backtesting.py
+++ b/freqtrade/optimize/backtesting.py
@@ -373,7 +373,9 @@ class Backtesting(object):
                         continue
                     trade_count_lock[row.date] = trade_count_lock.get(row.date, 0) + 1
 
-                trade_entry = self._get_sell_trade_entry(pair, row, ticker[pair][indexes[pair]:],
+                # since indexes has been incremented before, we need to go one step back to
+                # also check the buying candle for sell conditions.
+                trade_entry = self._get_sell_trade_entry(pair, row, ticker[pair][indexes[pair]-1:],
                                                          trade_count_lock, stake_amount,
                                                          max_open_trades)
 
diff --git a/freqtrade/tests/optimize/test_backtesting.py b/freqtrade/tests/optimize/test_backtesting.py
index 37757743e..59679d1a2 100644
--- a/freqtrade/tests/optimize/test_backtesting.py
+++ b/freqtrade/tests/optimize/test_backtesting.py
@@ -618,8 +618,9 @@ def test_processed(default_conf, mocker) -> None:
 
 
 def test_backtest_pricecontours(default_conf, fee, mocker) -> None:
+    # TODO: Evaluate usefullness of this, the patterns and buy-signls are unrealistic
     mocker.patch('freqtrade.exchange.Exchange.get_fee', fee)
-    tests = [['raise', 19], ['lower', 0], ['sine', 18]]
+    tests = [['raise', 19], ['lower', 0], ['sine', 35]]
     # We need to enable sell-signal - otherwise it sells on ROI!!
     default_conf['experimental'] = {"use_sell_signal": True}