diff --git a/home/.chezmoi.toml.tmpl b/home/.chezmoi.toml.tmpl
index ca943ee..2e208f7 100644
--- a/home/.chezmoi.toml.tmpl
+++ b/home/.chezmoi.toml.tmpl
@@ -1,3 +1,4 @@
+chezmoi:template:missing-key=invalid
 [data]
 email = {{ promptString "Git main email address " "" | quote }}
 {{- with promptInt "How many mbsync accounts would you generate " 0 -}}{{- $count := . | int }}