diff --git a/mirror.sh b/mirror.sh
index 153e410..ab195d6 100755
--- a/mirror.sh
+++ b/mirror.sh
@@ -3,6 +3,7 @@
 mkdir -p "$HOME/.ssh"
 echo "$INPUT_SSH_PRIV" > "$HOME/.ssh/id_ed25519"
 echo "$INPUT_KNOWN_HOSTS" > "$HOME/.ssh/known_hosts"
+chmod 600 "$HOME/.ssh/id_ed25519"
 
 git remote set-url --push origin "$INPUT_URL"
 git push origin "main:$GITHUB_REF_NAME"