diff --git a/release/install-release.sh b/release/install-release.sh
index 0d0d6958..d67ed56b 100755
--- a/release/install-release.sh
+++ b/release/install-release.sh
@@ -131,7 +131,7 @@ installSoftware(){
 
 # return 1: not apt or yum
 getPMT(){
-    if [ -n `command -v apt-get` ];then
+    if [[ -n `command -v apt-get` ]];then
         CMD_INSTALL="apt-get -y -qq install"
         CMD_UPDATE="apt-get -qq update"
     elif [[ -n `command -v yum` ]]; then