diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index 9660e0bcd..f74b07c20 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -242,7 +242,7 @@ NEWSPIDER_MODULE = ""
 
 PERIODIC_LOG_DELTA = None
 PERIODIC_LOG_STATS = None
-PERIODIC_LOG_TIMING_ENABLED = None
+PERIODIC_LOG_TIMING_ENABLED = False
 
 RANDOMIZE_DOWNLOAD_DELAY = True