diff --git a/bundles/wireguard/metadata.py b/bundles/wireguard/metadata.py
index 10a7a19..e2219cb 100644
--- a/bundles/wireguard/metadata.py
+++ b/bundles/wireguard/metadata.py
@@ -82,9 +82,7 @@ def icinga2(metadata):
 
     for peer, config in metadata.get('wireguard/peers', {}).items():
         services[f'WIREGUARD CONNECTION {peer}'] = {
-            'command_on_monitored_host': 'sudo /usr/local/share/icinga/plugins/check_wireguard_connected wg0 {}'.format(
-                config['pubkey'],
-            ),
+            'command_on_monitored_host': config['pubkey'].format_into('sudo /usr/local/share/icinga/plugins/check_wireguard_connected wg0 {}'),
         }
 
     return {