diff --git a/sys/arm64/coresight/coresight.c b/sys/arm64/coresight/coresight.c
index 5928c153f4a..9b9d3c65ecc 100644
--- a/sys/arm64/coresight/coresight.c
+++ b/sys/arm64/coresight/coresight.c
@@ -113,7 +113,7 @@ coresight_get_output_device(struct endpoint *endp, struct endpoint **out_endp)
 }
 
 static void
-coresight_init(void)
+coresight_init(void *dummy __unused)
 {
 
 	mtx_init(&cs_mtx, "ARM Coresight", NULL, MTX_DEF);