diff --git a/init.lua b/init.lua
index 41f45fd..7ff9c1c 100644
--- a/init.lua
+++ b/init.lua
@@ -45,6 +45,7 @@ minetest.register_node("memorandum:letter_empty", {
 	paramtype = "light",
 	paramtype2 = "facedir",
 	sunlight_propagates = true,
+	use_texture_alpha = "clip",
 	walkable = false,
 	node_box = {type = "fixed", fixed = sheet},
 	groups = {snappy=3,dig_immediate=3,not_in_creative_inventory=1},
@@ -153,6 +154,7 @@ minetest.register_node("memorandum:letter_written", {
 	},
 	paramtype = "light",
 	paramtype2 = "facedir",
+	use_texture_alpha = "clip",
 	sunlight_propagates = true,
 	walkable = false,
 	node_box = {type = "fixed", fixed = sheet},