diff --git a/map_formspec.lua b/map_formspec.lua
index e38ed66..5fbb14e 100644
--- a/map_formspec.lua
+++ b/map_formspec.lua
@@ -6,7 +6,7 @@ local MAP_NOISE = {
     offset = 0,
     scale = 1,
     spread = {x = 2, y = 2, z = 2},
-    seed = minetest.get_mapgen_setting("seed"),
+    seed = tonumber(minetest.get_mapgen_setting("seed")),
     octaves = 2,
     persist = 0.63,
     lacunarity = 2.0,