diff --git a/marble.lua b/marble.lua
index 4ad3a09..b122120 100644
--- a/marble.lua
+++ b/marble.lua
@@ -54,22 +54,24 @@ for _, color in ipairs({"red", "blue", "black"}) do
 		y_min          = planet_mars.y_start,
 	})
 
-	stairsplus:register_all("planet_mars", color .. "marble",  "planet_mars:" .. color .. "marble", {
-	  description = color .. " marble",
-	  tiles = {"planet_mars_" .. color .. "marble.png"},
-	  groups = {cracky=3}
-	})
+	if minetest.get_modpath("moreblocks") then
+		stairsplus:register_all("planet_mars", color .. "marble",  "planet_mars:" .. color .. "marble", {
+		  description = color .. " marble",
+		  tiles = {"planet_mars_" .. color .. "marble.png"},
+		  groups = {cracky=3}
+		})
 
-	stairsplus:register_all("planet_mars", color .. "marble_bricks",  "planet_mars:" .. color .. "marble_bricks", {
-	  description = color .. " marble bricks",
-	  tiles = {"planet_mars_" .. color .. "marble_bricks.png"},
-	  groups = {cracky=3}
-	})
+		stairsplus:register_all("planet_mars", color .. "marble_bricks",  "planet_mars:" .. color .. "marble_bricks", {
+		  description = color .. " marble bricks",
+		  tiles = {"planet_mars_" .. color .. "marble_bricks.png"},
+		  groups = {cracky=3}
+		})
 
-	stairsplus:register_all("planet_mars", color .. "marble_polished",  "planet_mars:" .. color .. "marble_polished", {
-	  description = color .. " marble polished",
-	  tiles = {"planet_mars_" .. color .. "marble_polished.png"},
-	  groups = {cracky=3}
-	})
+		stairsplus:register_all("planet_mars", color .. "marble_polished",  "planet_mars:" .. color .. "marble_polished", {
+		  description = color .. " marble polished",
+		  tiles = {"planet_mars_" .. color .. "marble_polished.png"},
+		  groups = {cracky=3}
+		})
+	end
 
 end