diff --git a/build/Dockerfile b/build/Dockerfile
index a872df2..2943fb2 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -7,7 +7,7 @@ COPY --chown=root:root --chmod=644 sshd_config /etc/ssh/
 
 EXPOSE 22
 
-RUN mkdir /ssh-host-keys /ssh-client-keys
+RUN install -dm700 /ssh-host-keys /ssh-client-keys
 
 COPY --chown=root:root --chmod=755 startup.sh /