diff --git a/src/main/java/org/betterx/bclib/api/v2/generator/BCLBiomeSource.java b/src/main/java/org/betterx/bclib/api/v2/generator/BCLBiomeSource.java
index 8c406bb8..411f4117 100644
--- a/src/main/java/org/betterx/bclib/api/v2/generator/BCLBiomeSource.java
+++ b/src/main/java/org/betterx/bclib/api/v2/generator/BCLBiomeSource.java
@@ -19,7 +19,7 @@ import java.util.Comparator;
 import java.util.List;
 import java.util.Set;
 
-public abstract class BCLBiomeSource extends BiomeSource implements BiomeSourceWithSeed, MergeableBiomeSource<BCLBiomeSource>, BiomeSourceWithNoiseRelatedSettings, BiomeSourceFromRegistry {
+public abstract class BCLBiomeSource extends BiomeSource implements BiomeSourceWithSeed, MergeableBiomeSource<BCLBiomeSource>, BiomeSourceWithNoiseRelatedSettings, BiomeSourceFromRegistry<BCLBiomeSource> {
     protected final Registry<Biome> biomeRegistry;
     protected long currentSeed;
     protected int maxHeight;
diff --git a/src/main/java/org/betterx/worlds/together/biomesource/BiomeSourceFromRegistry.java b/src/main/java/org/betterx/worlds/together/biomesource/BiomeSourceFromRegistry.java
index dd908026..2b0b2fa3 100644
--- a/src/main/java/org/betterx/worlds/together/biomesource/BiomeSourceFromRegistry.java
+++ b/src/main/java/org/betterx/worlds/together/biomesource/BiomeSourceFromRegistry.java
@@ -3,17 +3,17 @@ package org.betterx.worlds.together.biomesource;
 import net.minecraft.core.Holder;
 import net.minecraft.core.Registry;
 import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.biome.BiomeSource;
 
 import java.util.Set;
 
-public interface BiomeSourceFromRegistry {
+public interface BiomeSourceFromRegistry<T extends BiomeSource> {
     Registry<Biome> getBiomeRegistry();
-    Set<Holder<Biome>> possibleBiomes();
 
-    default boolean sameRegistryButDifferentBiomes(BiomeSourceFromRegistry other) {
+    default <R extends BiomeSource> boolean sameRegistryButDifferentBiomes(BiomeSourceFromRegistry<R> other) {
         if (other.getBiomeRegistry() == getBiomeRegistry()) {
-            Set<Holder<Biome>> mySet = this.possibleBiomes();
-            Set<Holder<Biome>> otherSet = other.possibleBiomes();
+            Set<Holder<Biome>> mySet = ((T) this).possibleBiomes();
+            Set<Holder<Biome>> otherSet = ((R) other).possibleBiomes();
             if (otherSet.size() != mySet.size()) return true;
             for (Holder<Biome> b : mySet) {
                 if (!otherSet.contains(b))