diff --git a/data/etc/apache2/conf-available/freedombox.conf b/data/etc/apache2/conf-available/freedombox.conf
index 63da718dd..33d57a2a2 100644
--- a/data/etc/apache2/conf-available/freedombox.conf
+++ b/data/etc/apache2/conf-available/freedombox.conf
@@ -154,3 +154,12 @@ ErrorLog "|/usr/bin/systemd-cat --identifier=apache-error"
 # records its own timestamp.
 ErrorLogFormat "[%-m:%l] [pid %P:tid %{g}T] %7F: %E: [client\ %a] %M% ,\ referer\ %{Referer}i"
 CustomLog "|/usr/bin/systemd-cat --identifier=apache-access" vhost_combined
+
+## When showing an index page for a directory listing, ensure that viewport's
+## width is the same as the device's width. Directory index pages generated by
+## mod_autoindex are reasonably suitable for mobile devices. However, without
+## the directive, mobile devices will assume the page to be not-mobile friendly
+## and use a larger view port than the device size.
+<IfModule mod_autoindex.c>
+    IndexHeadInsert "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">"
+</IfModule>