diff --git a/code/datums/mapgen/Cavegens/LavalandGenerator.dm b/code/datums/mapgen/Cavegens/LavalandGenerator.dm
index 88718599aff..3c21949ce0c 100644
--- a/code/datums/mapgen/Cavegens/LavalandGenerator.dm
+++ b/code/datums/mapgen/Cavegens/LavalandGenerator.dm
@@ -42,3 +42,4 @@
 
 /datum/map_generator/cave_generator/lavaland/ruin_version
 	weighted_open_turf_types = list(/turf/open/misc/asteroid/basalt/lava_land_surface/no_ruins = 1)
+	weighted_closed_turf_types = list(/turf/closed/mineral/random/volcanic/do_not_chasm = 1)