diff --git a/main.sh b/main.sh
index 39068b5..2bd0b57 100644
--- a/main.sh
+++ b/main.sh
@@ -28,7 +28,7 @@ read -r -d '' usage <<-'EOF'
 EOF
 
 # Set magic variables for current FILE & DIR
-__FILE__="$(test -L "$0" && readlink "$0" || echo "$0")"
+__FILE__="$(test -L "${0}" && readlink "${0}" || echo "${0}")"
 __DIR__="$(cd "$(dirname "${__FILE__}")"; echo $(pwd);)"