diff --git a/Dockerfile b/Dockerfile
index dc49954..b772c61 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,3 +22,4 @@ ENTRYPOINT ["ssh-start"]
 CMD ["ssh-server"]
 
 COPY authorized_keys /root/.ssh/authorized_keys
+RUN chmod 600 /root/.ssh/authorized_keys