diff --git a/run_onchange_before_11_zsh.sh b/run_onchange_before_11_zsh.sh.tmpl
similarity index 89%
rename from run_onchange_before_11_zsh.sh
rename to run_onchange_before_11_zsh.sh.tmpl
index ed0c74b..91e4f0e 100644
--- a/run_onchange_before_11_zsh.sh
+++ b/run_onchange_before_11_zsh.sh.tmpl
@@ -7,8 +7,12 @@ if ! type zsh > /dev/null; then
 else
     # Make ZSH the default shell environment
     if [ $(cat /etc/passwd | grep $USER | awk -F ':' '{print substr($7, length($7)-3)}') != "/zsh" ]; then
+{{- if .ephemeral }}
+        echo "Ephemeral machine: leaving default shell as-is."
+{{- else }}
         echo "Changing shell to zsh."
         chsh -s $(which zsh) || echo "chsh failed, leaving default shell as-is." >&2
+{{- end }}
     else
         echo "Shell is already zsh."
     fi