diff --git a/install.sh b/install.sh
index 8dc2646..0fb0d23 100644
--- a/install.sh
+++ b/install.sh
@@ -121,7 +121,7 @@ install_XrayR() {
             exit 1
         fi
     else
-        if [ $1 == v*]; then
+        if [[ $1 == v*]]; then
             last_version=$1
 	else
 	    last_version="v"$1