diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 02a09eb9cd..ad4cd6721e 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -1285,6 +1285,9 @@ static int save_opt_one(void *opaque,
             g_byte_array_append(data, (guint8 *)buf, ret);
         }
 
+        buf[0] = '\0';
+        g_byte_array_append(data, (guint8 *)buf, 1);
+
         qemu_close(fd);
 
         *opt->dest = g_renew(char *, *opt->dest, (*opt->ndest) + 1);