diff --git a/sys/riscv/riscv/db_trace.c b/sys/riscv/riscv/db_trace.c
index dbc2ba92bce3..56508464e7c6 100644
--- a/sys/riscv/riscv/db_trace.c
+++ b/sys/riscv/riscv/db_trace.c
@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 #include <machine/vmparam.h>
 
 void
-db_md_list_watchpoints()
+db_md_list_watchpoints(void)
 {
 
 }