diff --git a/config/chroot_local-includes/usr/local/lib/tails-shell-library/tor-browser.sh b/config/chroot_local-includes/usr/local/lib/tails-shell-library/tor-browser.sh
index c3dff070984579985eef8137e368b2f9930e1db2..bb544be584f0c2ec636c7035f8c175c2f9aa6d17 100644
--- a/config/chroot_local-includes/usr/local/lib/tails-shell-library/tor-browser.sh
+++ b/config/chroot_local-includes/usr/local/lib/tails-shell-library/tor-browser.sh
@@ -89,7 +89,7 @@ configure_xulrunner_app_locale() {
     profile="${1}"
     locale="${2}"
     mkdir -p "${profile}"/preferences
-    echo "pref(\"general.useragent.locale\", \"${locale}\");" > \
+    echo "pref(\"intl.locale.requested\", \"${locale}\");" > \
         "${profile}"/prefs.js
 }