diff --git a/src/main/java/me/desht/pneumaticcraft/common/worldgen/OilLakeFilter.java b/src/main/java/me/desht/pneumaticcraft/common/worldgen/OilLakeFilter.java
index bf6e2b391..cfd132fac 100644
--- a/src/main/java/me/desht/pneumaticcraft/common/worldgen/OilLakeFilter.java
+++ b/src/main/java/me/desht/pneumaticcraft/common/worldgen/OilLakeFilter.java
@@ -5,7 +5,6 @@
 import me.desht.pneumaticcraft.common.config.ConfigHelper;
 import me.desht.pneumaticcraft.common.registry.ModPlacementModifierTypes;
 import me.desht.pneumaticcraft.common.util.WildcardedRLMatcher;
-import me.desht.pneumaticcraft.mixin.accessors.WorldGenRegionAccess;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Holder;
 import net.minecraft.core.Registry;
@@ -41,10 +40,10 @@ protected boolean shouldPlace(PlacementContext context, RandomSource rand, Block
         // don't allow oil lakes to generate within any structure feature in pneumaticcraft:no_oil_lakes tag
         if (context.getLevel() instanceof WorldGenRegion region) {
             SectionPos sectionPos = SectionPos.of(origin);
-            ChunkAccess chunkAccess = context.getLevel().getChunk(origin);
+            ChunkAccess chunkAccess = region.getChunk(origin);
 
-            Registry<Structure> reg = context.getLevel().registryAccess().registryOrThrow(Registries.STRUCTURE);
-            StructureManager sfManager = ((WorldGenRegionAccess)region).getStructureManager();
+            Registry<Structure> reg = region.registryAccess().registryOrThrow(Registries.STRUCTURE);
+            StructureManager sfManager = region.getLevel().structureManager().forWorldGenRegion(region);
 
             for (Holder<Structure> structureHolder : reg.getOrCreateTag(PneumaticCraftTags.Structures.NO_OIL_LAKES)) {
                 StructureStart startForFeature = sfManager.getStartForStructure(sectionPos, structureHolder.value(), chunkAccess);
diff --git a/src/main/java/me/desht/pneumaticcraft/mixin/accessors/WorldGenRegionAccess.java b/src/main/java/me/desht/pneumaticcraft/mixin/accessors/WorldGenRegionAccess.java
deleted file mode 100644
index fd86ac03c..000000000
--- a/src/main/java/me/desht/pneumaticcraft/mixin/accessors/WorldGenRegionAccess.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package me.desht.pneumaticcraft.mixin.accessors;
-
-import net.minecraft.server.level.WorldGenRegion;
-import net.minecraft.world.level.StructureManager;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Accessor;
-
-@Mixin(WorldGenRegion.class)
-public interface WorldGenRegionAccess {
-    @Accessor
-    StructureManager getStructureManager();
-}
diff --git a/src/main/resources/mixins.pneumaticcraft.json b/src/main/resources/mixins.pneumaticcraft.json
index aff679fed..7b9fd87b3 100644
--- a/src/main/resources/mixins.pneumaticcraft.json
+++ b/src/main/resources/mixins.pneumaticcraft.json
@@ -20,7 +20,6 @@
     "accessors.ShulkerAccess",
     "accessors.StructureTemplatePoolAccess",
     "accessors.WitchAccess",
-    "accessors.WorldGenRegionAccess",
     "coremods.BaseSpawnerMixin",
     "coremods.LivingEntityMixin"
   ],