diff --git a/init.lua b/init.lua
index 7c3220d..a92eed7 100644
--- a/init.lua
+++ b/init.lua
@@ -61,7 +61,7 @@ local function register_stairsplus_alias_force(modname, origname, newmod, newnam
 		minetest.register_alias_force(
 				modname .. ":" .. prefix ..
 				origname .. suffix,
-				newmod .. ":" prefix ..
+				newmod .. ":" .. prefix ..
 				newname .. suffix)
 	end
 end