diff --git a/tools/upgrade.sh b/tools/upgrade.sh
index b2a1c06c4..4160db964 100644
--- a/tools/upgrade.sh
+++ b/tools/upgrade.sh
@@ -1,6 +1,6 @@
 current_path=`pwd`
 printf '\033[0;34m%s\033[0m\n' "Upgrading Oh My Zsh"
-cd $ZSH
+cd "$ZSH"
 
 if git pull origin master
 then