diff --git a/technic_worldgen/nodes.lua b/technic_worldgen/nodes.lua
index dfd545b..90888e4 100644
--- a/technic_worldgen/nodes.lua
+++ b/technic_worldgen/nodes.lua
@@ -57,7 +57,7 @@ minetest.register_node( ":technic:granite", {
 minetest.register_node( ":technic:granite_bricks", {
 	description = S("Granite Bricks"),
 	tiles = { "technic_granite_bricks.png" },
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {cracky=1},
 	sounds = default.node_sound_stone_defaults(),
 })
@@ -73,7 +73,7 @@ minetest.register_node( ":technic:marble", {
 minetest.register_node( ":technic:marble_bricks", {
 	description = S("Marble Bricks"),
 	tiles = { "technic_marble_bricks.png" },
-	is_ground_content = true,
+	is_ground_content = false,
 	groups = {cracky=3},
 	sounds = default.node_sound_stone_defaults(),
 })