diff --git a/oh-my-zsh.sh b/oh-my-zsh.sh
index c4522491b..f77762815 100644
--- a/oh-my-zsh.sh
+++ b/oh-my-zsh.sh
@@ -1,7 +1,7 @@
 # Check for updates on initial load...
 if [ "$DISABLE_AUTO_UPDATE" != "true" ]
 then
-  /usr/bin/env zsh $ZSH/tools/check_for_upgrade.sh
+  /usr/bin/env ZSH=$ZSH zsh $ZSH/tools/check_for_upgrade.sh
 fi
 
 # Initializes Oh My Zsh