diff --git a/setup-sshd.sh b/setup-sshd.sh
index 3d2f55d..79f1141 100755
--- a/setup-sshd.sh
+++ b/setup-sshd.sh
@@ -9,4 +9,8 @@ ssh-keygen -A
 mkdir -vp /tmp/.ssh
 echo "$SSH_PUBKEY" | tee -a /tmp/.ssh/authorized_keys
 
+chmod go-w /tmp
+chmod 700 /tmp/.ssh
+chmod 600 /tmp/.ssh/authorized_keys
+
 exec /usr/sbin/sshd -De