diff --git a/data/mods/Magiclysm/worldgen/black_dragon_lair.json b/data/mods/Magiclysm/worldgen/black_dragon_lair.json
index 72ef237e7a948..a3621e8d6c766 100644
--- a/data/mods/Magiclysm/worldgen/black_dragon_lair.json
+++ b/data/mods/Magiclysm/worldgen/black_dragon_lair.json
@@ -9,7 +9,6 @@
     ],
     "object": {
       "fill_ter": "t_water_sh",
-      "predecessor_mapgen": "forest_water",
       "rows": [
         "................................................",
         "................................................",