diff --git a/.mutt/view-html.sh b/.mutt/view-html.sh
index bbc7d26b..bac9bbb8 100755
--- a/.mutt/view-html.sh
+++ b/.mutt/view-html.sh
@@ -2,7 +2,7 @@
 
 ## Force UTF-8, otherwise most browsers will display ASCII.
 
-umask 0600
+umask 077
 root="/tmp/mutt-$(id -u)"
 mkdir -p "$root"
 file="$root"/mail.html