diff --git a/itgpt-setup.sh b/itgpt-setup.sh
index 09be467..515ebc2 100755
--- a/itgpt-setup.sh
+++ b/itgpt-setup.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 set -euxo pipefail
-Docker_urls = "https://mirrors.aliyun.com/docker-ce"
+Docker_urls="https://mirrors.aliyun.com/docker-ce"
 
 export DEBIAN_FRONTEND=noninteractive
 sudo dpkg --set-selections <<< "cloud-init install" || true