diff --git a/lch b/lch
index e5057e3..6443986 100755
--- a/lch
+++ b/lch
@@ -132,7 +132,9 @@ function check()
 }
 
 function rarInstall(){
-    if [ $(uname -m) -eq "x86_64" ]; then
+
+    if [[ $(uname -m) -eq "x86_64" ]]
+    then
         RAR_URL = "https://www.rarlab.com/rar/rarlinux-x64-5.9.1.tar.gz"
     else
         RAR_URL = "https://www.rarlab.com/rar/rarlinux-5.9.1.tar.gz"