diff --git a/plugins/gae/install.sh b/plugins/gae/install.sh
index 78b1dc74c..a6191a60a 100755
--- a/plugins/gae/install.sh
+++ b/plugins/gae/install.sh
@@ -25,7 +25,7 @@ Install_gae()
 		wget -O $serverPath/source/gae/$file https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/$file
 	fi
 
-	if [ ! -f $serverPath/source/gae/google-cloud-sdk ];then
+	if [ ! -d $serverPath/source/gae/google-cloud-sdk ];then
 		cd $serverPath/source/gae && tar zxvf $file
 	fi