diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index afdb8aa0c067b8f8138e742d6052712c6385ed7a..11f61294fcf4aa8a6d3632f3afad0f55ad65f265 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -281,7 +281,7 @@ static void milkymist_memcard_realize(DeviceState *dev, Error **errp)
     carddev = qdev_new(TYPE_SD_CARD);
     qdev_prop_set_drive(carddev, "drive", blk);
     if (!qdev_realize_and_unref(carddev, BUS(&s->sdbus), &err)) {
-        error_propagate_prepend(errp, err, "failed to init SD card: %s");
+        error_propagate_prepend(errp, err, "failed to init SD card");
         return;
     }
     s->enabled = blk && blk_is_inserted(blk);