diff --git a/mods/default/nodes.lua b/mods/default/nodes.lua
index aecbd357..2f77533c 100644
--- a/mods/default/nodes.lua
+++ b/mods/default/nodes.lua
@@ -1636,6 +1636,7 @@ minetest.register_node("default:glass", {
 	description = "Glass",
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_glass.png", "default_glass_detail.png"},
+	special_tiles = {"blank.png"},
 	inventory_image = minetest.inventorycube("default_glass.png"),
 	paramtype = "light",
 	sunlight_propagates = true,
@@ -1648,6 +1649,7 @@ minetest.register_node("default:obsidian_glass", {
 	description = "Obsidian Glass",
 	drawtype = "glasslike_framed_optional",
 	tiles = {"default_obsidian_glass.png", "default_obsidian_glass_detail.png"},
+	special_tiles = {"blank.png"},
 	inventory_image = minetest.inventorycube("default_obsidian_glass.png"),
 	paramtype = "light",
 	is_ground_content = false,