diff --git a/sys/riscv/riscv/mp_machdep.c b/sys/riscv/riscv/mp_machdep.c
index 5e8ae3db10e..71eb9a56193 100644
--- a/sys/riscv/riscv/mp_machdep.c
+++ b/sys/riscv/riscv/mp_machdep.c
@@ -73,8 +73,6 @@ __FBSDID("$FreeBSD$");
 
 #define	MP_BOOTSTACK_SIZE	(kstack_pages * PAGE_SIZE)
 
-boolean_t ofw_cpu_reg(phandle_t node, u_int, cell_t *);
-
 uint32_t __riscv_boot_ap[MAXCPU];
 
 static enum {