diff --git a/scrapy/settings/default_settings.py b/scrapy/settings/default_settings.py
index 0ea014007..62c3e4c94 100644
--- a/scrapy/settings/default_settings.py
+++ b/scrapy/settings/default_settings.py
@@ -209,7 +209,7 @@ REFERER_ENABLED = True
 
 RETRY_ENABLED = True
 RETRY_TIMES = 2  # initial response + 2 retries = 3 requests
-RETRY_HTTP_CODES = [500, 502, 503, 504, 400, 408]
+RETRY_HTTP_CODES = [500, 502, 503, 504, 408]
 RETRY_PRIORITY_ADJUST = -1
 
 ROBOTSTXT_OBEY = False