diff --git a/freqtrade/loggers/set_log_levels.py b/freqtrade/loggers/set_log_levels.py
index d666361b6..7311fa0a0 100644
--- a/freqtrade/loggers/set_log_levels.py
+++ b/freqtrade/loggers/set_log_levels.py
@@ -50,6 +50,6 @@ def restore_verbosity_for_bias_tester() -> None:
     Restore verbosity after bias tester.
     """
     logger.info("Restoring log verbosity.")
-    log_level = logging.getLogger('freqtrade').getEffectiveLevel()
+    log_level = logging.NOTSET
     for logger_name in __BIAS_TESTER_LOGGERS:
         logging.getLogger(logger_name).setLevel(log_level)
diff --git a/tests/test_log_setup.py b/tests/test_log_setup.py
index 2ce06b6b0..af9c43fbd 100644
--- a/tests/test_log_setup.py
+++ b/tests/test_log_setup.py
@@ -133,16 +133,17 @@ def test_set_loggers_journald_importerror(import_fails):
 
 
 def test_reduce_verbosity():
+    setup_logging_pre()
     reduce_verbosity_for_bias_tester()
 
-    assert logging.getLogger('freqtrade.resolvers').level is logging.WARNING
-    assert logging.getLogger('freqtrade.strategy.hyper').level is logging.WARNING
+    assert logging.getLogger('freqtrade.resolvers').getEffectiveLevel() is logging.WARNING
+    assert logging.getLogger('freqtrade.strategy.hyper').getEffectiveLevel() is logging.WARNING
     # base level wasn't changed
-    assert logging.getLogger('freqtrade').level is logging.INFO
+    assert logging.getLogger('freqtrade').getEffectiveLevel() is logging.INFO
 
     restore_verbosity_for_bias_tester()
 
-    assert logging.getLogger('freqtrade.resolvers').level is logging.INFO
-    assert logging.getLogger('freqtrade.strategy.hyper').level is logging.INFO
-    assert logging.getLogger('freqtrade').level is logging.INFO
+    assert logging.getLogger('freqtrade.resolvers').getEffectiveLevel() is logging.INFO
+    assert logging.getLogger('freqtrade.strategy.hyper').getEffectiveLevel() is logging.INFO
+    assert logging.getLogger('freqtrade').getEffectiveLevel() is logging.INFO
     # base level wasn't changed