diff --git a/sys/i386/i386/perfmon.c b/sys/i386/i386/perfmon.c
index cb8c0acfc0dc..813cb4cfd1aa 100644
--- a/sys/i386/i386/perfmon.c
+++ b/sys/i386/i386/perfmon.c
@@ -113,8 +113,7 @@ perfmon_init(void)
 }
 
 static void
-perfmon_init_dev(dummy)
-	void *dummy;
+perfmon_init_dev(void *dummy)
 {
 	make_dev(&perfmon_cdevsw, 32, UID_ROOT, GID_KMEM, 0640, "perfmon");
 }