diff --git a/lib/device/iwm/fuji.cpp b/lib/device/iwm/fuji.cpp
index f21de5265..b68bdfaa2 100644
--- a/lib/device/iwm/fuji.cpp
+++ b/lib/device/iwm/fuji.cpp
@@ -386,13 +386,14 @@ uint8_t iwmFuji::iwm_ctrl_disk_image_mount() // SP CTRL command
 	// mediatype_t mt = MediaType::discover_mediatype(disk.filename);
 	// if (mt == mediatype_t::MEDIATYPE_PO)
 	// { // And now mount it
-	disk.disk_type = disk_dev->mount(disk.fileh, disk.filename, disk.disk_size);
 
 	if (options == DISK_ACCESS_MODE_WRITE)
 	{
 		disk_dev->readonly = false;
 	}
 
+	disk.disk_type = disk_dev->mount(disk.fileh, disk.filename, disk.disk_size);
+
 	return SP_ERR_NOERROR;
 }