diff --git a/mkimg.sh b/mkimg.sh
index aa2d1fe..79520fa 100755
--- a/mkimg.sh
+++ b/mkimg.sh
@@ -49,7 +49,7 @@ B=$(dirname $0)
 cd $B
 [ ! -d "$W" ] && echo "$W is not a directory" && exit 1
 # start antd-tunnel service
-if[ ! -f "$W/antd-config.ini" ]; then
+if [ ! -f "$W/antd-config.ini" ]; then
     cp ./opt/www/antd-config.ini $W/antd-config.ini
     mkdir -p $W/db
     chmod 700 $W/db