diff --git a/fs/ubifs/master.c b/fs/ubifs/master.c
index 71d5493..a88f338 100644
--- a/fs/ubifs/master.c
+++ b/fs/ubifs/master.c
@@ -354,7 +354,7 @@
 	int err, lnum, offs, len;
 
 	if (c->ro_media)
-		return -EINVAL;
+		return -EROFS;
 
 	lnum = UBIFS_MST_LNUM;
 	offs = c->mst_offs + c->mst_node_alsz;