--- collectd-5.12.0.orig/src/virt.c	2026-10-18 06:43:03.978177307 +0200
+++ collectd-5.12.0/src/virt.c	2026-10-18 06:43:03.988165560 +0200
@@ -2205,7 +2205,7 @@ static int domain_lifecycle_event_cb(__a
   return 0;
 }
 
-static void virt_eventloop_timeout_cb(int timer ATTRIBUTE_UNUSED,
+static void virt_eventloop_timeout_cb(int timer __attribute__((unused)),
                                       void *timer_info) {}
 
 static int register_event_impl(void) {