diff --git a/sapi/fpm/fpm/events/kqueue.c b/sapi/fpm/fpm/events/kqueue.c
index 8fc4a6f049b..b81650d7741 100644
--- a/sapi/fpm/fpm/events/kqueue.c
+++ b/sapi/fpm/fpm/events/kqueue.c
@@ -96,7 +96,7 @@ static int fpm_event_kqueue_init(int max) /* {{{ */
/*
* release kqueue stuff
*/
-static int fpm_event_kqueue_clean() /* {{{ */
+static int fpm_event_kqueue_clean(void) /* {{{ */
{
if (kevents) {
free(kevents);
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