--- a/data/minecraft/worldgen/noise_settings/overworld.json
+++ b/data/minecraft/worldgen/noise_settings/overworld.json
@@ -389,7 +_,8 @@
       {
         "type": "minecraft:condition",
         "if_true": {
-          "type": "minecraft:vertical_gradient",
+          "type": "paper:optionally_flat_bedrock_condition_source",
+          "is_roof": false,
           "false_at_and_above": {
             "above_bottom": 5
           },
