diff --git a/vl.c b/vl.c
index 1329c30..fe1f33b 100644
--- a/vl.c
+++ b/vl.c
@@ -2431,7 +2431,7 @@ int main(int argc, char **argv, char **envp)
                 drive_add(IF_MTD, -1, optarg, MTD_OPTS);
                 break;
             case QEMU_OPTION_sd:
-                drive_add(IF_SD, 0, optarg, SD_OPTS);
+                drive_add(IF_SD, -1, optarg, SD_OPTS);
                 break;
             case QEMU_OPTION_pflash:
                 drive_add(IF_PFLASH, -1, optarg, PFLASH_OPTS);