diff --git a/nixos/modules/services/web-apps/kimai.nix b/nixos/modules/services/web-apps/kimai.nix
index 3ffa089a756e..47e1dfc20981 100644
--- a/nixos/modules/services/web-apps/kimai.nix
+++ b/nixos/modules/services/web-apps/kimai.nix
@@ -320,6 +320,10 @@ in
 
                 umask $oldUmask
 
+                # Ensure that our local.yaml is valid (see kimai:reload command).
+                ${pkg hostName cfg}/bin/console lint:yaml --parse-tags \
+                  ${pkg hostName cfg}/share/php/kimai/config
+
                 # Run kimai:install to ensure database is created or updated.
                 # Note that kimai:update is an alias to kimai:install.
                 ${pkg hostName cfg}/bin/console kimai:install --no-cache