diff --git a/acme.sh b/acme.sh
index a4224fc..b9e57a7 100755
--- a/acme.sh
+++ b/acme.sh
@@ -4545,7 +4545,7 @@ _installcert() {
       cat "$CERT_KEY_PATH" >"$_real_key"
     else
       cat "$CERT_KEY_PATH" >"$_real_key"
-      chmod 700 "$_real_key"
+      chmod 600 "$_real_key"
     fi
   fi