diff --git a/stand/common/bcache.c b/stand/common/bcache.c
index e35d7595fbe3..a020f3c3c53c 100644
--- a/stand/common/bcache.c
+++ b/stand/common/bcache.c
@@ -467,7 +467,7 @@ bcache_invalidate(struct bcache *bc, daddr_t blkno)
 COMMAND_SET(bcachestat, "bcachestat", "get disk block cache stats", command_bcache);
 
 static int
-command_bcache(int argc, char *argv[])
+command_bcache(int argc, char *argv[] __unused)
 {
     if (argc != 1) {
 	command_errmsg = "wrong number of arguments";