diff --git a/etc/sudoers.d/lecture b/etc/sudoers.d/lecture
index b62d0b8f..3bbff001 100644
--- a/etc/sudoers.d/lecture
+++ b/etc/sudoers.d/lecture
@@ -4,4 +4,9 @@
 # & https://serverfault.com/a/333640
 Defaults lecture = always
 
+# Don't create .sudo_as_admin_successful to $HOME. It might not strictly
+# be related to lecture (being common global bashrc), but close enough for
+# me considering both have similar effects of printing information.
+Defaults !admin_flag
+
 # vim: filetype=sudoers