diff --git a/Files/mailserver/mailman/mailman-hyperkitty.cfg.erb b/Files/mailserver/mailman/mailman-hyperkitty.cfg.erb
index ca3961d50f92c9eccdfcca7d38df9c6211942314..613ddb2e873a71bb7e234ccf485c15b159adf512 100644
--- a/Files/mailserver/mailman/mailman-hyperkitty.cfg.erb
+++ b/Files/mailserver/mailman/mailman-hyperkitty.cfg.erb
@@ -17,4 +17,4 @@ base_url: https://lists.lysator.liu.se/mailman/hyperkitty/
 
 # Shared API key, must be the identical to the value in HyperKitty's
 # settings.
-api_key: '<%= import(@pupsecrets + "/mailman_archiver") -%>'
+api_key: <%= import(@pupsecrets + "/mailman_archiver") -%>