diff --git a/.update.sh b/.update.sh
index a3a42e9..23f2dd8 100644
--- a/.update.sh
+++ b/.update.sh
@@ -11,7 +11,7 @@ DFS_UPDATE_CHANNEL=${DFS_UPDATE_CHANNEL:-"main"}
 apost_beacon "sys.online"
 
 # update dns
-if [[ "$DFS_DDNS_ENABLE" == "$1" ]]; then
+if [[ "$DFS_DDNS_ENABLE" == "1" ]]; then
     fmt_info "updating dns ..."
     "$THIS_DIR/tools/logger.sh" ddns || (fmt_error "failed to update dns" && apost_beacon "dfs.ddns.failed")
 fi