diff --git a/lib/functions.zsh b/lib/functions.zsh
index ef7cc6383..d2dcadd0c 100644
--- a/lib/functions.zsh
+++ b/lib/functions.zsh
@@ -3,11 +3,11 @@ function zsh_stats() {
 }
 
 function uninstall_oh_my_zsh() {
-  /bin/sh $ZSH/tools/uninstall.sh
+  /usr/bin/env ZSH=$ZSH /bin/sh $ZSH/tools/uninstall.sh
 }
 
 function upgrade_oh_my_zsh() {
-  /bin/sh $ZSH/tools/upgrade.sh
+  /usr/bin/env ZSH=$ZSH /bin/sh $ZSH/tools/upgrade.sh
 }
 
 function take() {