diff --git a/ietf/settings.py b/ietf/settings.py
index 6623dd391..8cff632b4 100644
--- a/ietf/settings.py
+++ b/ietf/settings.py
@@ -26,6 +26,7 @@ warnings.filterwarnings("ignore", message="Duplicate index '.*' defined on the t
 # Warnings found under Python 3.7:
 warnings.filterwarnings("ignore", message="'U' mode is deprecated", module="docutils.io")
 warnings.filterwarnings("ignore", message="'U' mode is deprecated", module="xml2rfc")
+warnings.filterwarnings("ignore", message="'U' mode is deprecated", module="site")
 warnings.filterwarnings("ignore", message="Flags not at the start of the expression", module="genshi")