diff --git a/mod.conf b/mod.conf
index a8bfea1..c35b2e0 100644
--- a/mod.conf
+++ b/mod.conf
@@ -1,4 +1,4 @@
 name = moretrees
 depends = default, vessels
-optional_depends = doors, stairs, moreblocks, farming
+optional_depends = doors, stairs, moreblocks, farming, ethereal
 min_minetest_version = 5.2.0