diff --git a/cmdline/unix.c b/cmdline/unix.c
index 8587f1c6..50b4c5b0 100644
--- a/cmdline/unix.c
+++ b/cmdline/unix.c
@@ -1789,6 +1789,7 @@ const char* AMBIENT_LABEL[] = {
 	"systin",
 	"auxtin",
 	"mb",
+	"m/b",
 	"board",
 	"motherboard",
 	"system",