diff --git a/rebuild.sh b/rebuild.sh
index 4cacb5c..e613275 100755
--- a/rebuild.sh
+++ b/rebuild.sh
@@ -1,13 +1,13 @@
 #!/bin/sh
 
-if [ "$1" = "--help" ] || [ "$1" = "-h" ]; then
+if [[ "$1" = "--help" ]] || [[ "$1" = "-h" ]]; then
     echo "Usage: rebuild.sh [-h | --help] [-c | --clean-garbage] [machine]"
     exit
 fi
 
 sudo true
 
-if [ -n "$1" ]; then
+if [[ -n "$1" ]]; then
   machine = $1
 else
   read -p "What machine would you want to build? [$(ls --format=commas machines)]: " machine