diff --git a/drivers/dfu/dfu_mmc.c b/drivers/dfu/dfu_mmc.c
index f942758..0816f46 100644
--- a/drivers/dfu/dfu_mmc.c
+++ b/drivers/dfu/dfu_mmc.c
@@ -73,16 +73,12 @@
 			op == DFU_OP_READ ? "load" : "write",
 			dfu->data.mmc.dev, dfu->data.mmc.part,
 			(unsigned int) buf, dfu->name);
-		if (op == DFU_OP_WRITE)
-			sprintf(cmd_buf + strlen(cmd_buf), " %lx", *len);
 		break;
 	case DFU_FS_EXT4:
 		sprintf(cmd_buf, "ext4%s mmc %d:%d 0x%x /%s",
 			op == DFU_OP_READ ? "load" : "write",
 			dfu->data.mmc.dev, dfu->data.mmc.part,
 			(unsigned int) buf, dfu->name);
-		if (op == DFU_OP_WRITE)
-			sprintf(cmd_buf + strlen(cmd_buf), " %ld", *len);
 		break;
 	default:
 		printf("%s: Layout (%s) not (yet) supported!\n", __func__,
@@ -90,6 +86,9 @@
 		return -1;
 	}
 
+	if (op == DFU_OP_WRITE)
+		sprintf(cmd_buf + strlen(cmd_buf), " %lx", *len);
+
 	debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
 
 	ret = run_command(cmd_buf, 0);