diff --git a/bin/brew b/bin/brew
index fd2d7108db..702f36a719 100755
--- a/bin/brew
+++ b/bin/brew
@@ -1,9 +1,6 @@
 #!/bin/sh
-BREW_FILE_DIRECTORY=$(dirname "$0")
-BREW_FILE_DIRECTORY=$(cd "$BREW_FILE_DIRECTORY" && pwd -P)
-
-BREW_FILENAME=$(basename "$0")
-export HOMEBREW_BREW_FILE="$BREW_FILE_DIRECTORY/$BREW_FILENAME"
+BREW_FILE_DIRECTORY=$(cd "${0%/*}" && pwd -P)
+export HOMEBREW_BREW_FILE="$BREW_FILE_DIRECTORY/${0##*/}"
 
 BREW_SYMLINK=$(readlink $0)
 if [ -n "$BREW_SYMLINK" ]