diff --git a/shell/.zshrc b/shell/.zshrc
index 961d268..dc05350 100644
--- a/shell/.zshrc
+++ b/shell/.zshrc
@@ -33,7 +33,7 @@ setopt NO_BG_NICE
 # Check for updates...
 # Stolen and modified Oh-My-ZSH's update system
 if [ "${ENABLE_DOTFILES_AUTO_UPDATE}" ]; then
-  env ZSH=$ZSH _DOTFILES=$_DOTFILES DISABLE_UPDATE_PROMPT=$DISABLE_DOTFILES_UPDATE_PROMPT zsh -f $_DOTFILES/check_for_upgrade.sh
+  env ZSH=$ZSH _DOTFILES="${_DOTFILES}" DISABLE_UPDATE_PROMPT="${DISABLE_DOTFILES_UPDATE_PROMPT}" zsh -f "${_DOTFILES}/check_for_upgrade.sh"
 fi
 
 # Oh-My-ZSH Options below this line