diff --git a/opt/backup-fs b/opt/backup-fs
index 328946f..9db16b2 100644
--- a/opt/backup-fs
+++ b/opt/backup-fs
@@ -3,7 +3,8 @@
 function yesno {
   unset DISCARD_ME
   while [ -z "$DISCARD_ME" ]; do
-    read -p "[y/n] " -n1 DISCARD_ME
+    # get input from /dev/tty to work around missing stdin
+    read -p "[y/n] " -n1 DISCARD_ME < /dev/tty
     case "$DISCARD_ME" in
       y)
         return 0
@@ -24,14 +25,14 @@ function yesno {
 cat /proc/mounts
 
 read -p "
-press any key" -n1 DISCARD_ME
+press any key" -n1 DISCARD_ME < /dev/tty
 
 # And no services running?
 
 ps aux | grep -vF "[kworker"
 
 read -p "
-press any key" -n1 DISCARD_ME
+press any key" -n1 DISCARD_ME < /dev/tty
 
 #TODO: remove above debugging sanity checks