[1.12] Villages in custom biomes

I created a custom biome extended from the HIlls Biome. When i register this biome i don't add it to the villages biomes, but for some reason villages still spawns in my biome. How can i avoid this? This is the code for the biome 

 
	package com.mw.world.biome;
	import java.util.Iterator;
import java.util.Random;
	import com.mw.MW;
import com.mw.core.MWBlocks;
import com.mw.world.gen.feature.WorldGenVolcano;
	import net.minecraft.entity.monster.EntityMagmaCube;
import net.minecraft.entity.monster.EntityPolarBear;
import net.minecraft.entity.monster.EntitySkeleton;
import net.minecraft.entity.monster.EntityStray;
import net.minecraft.init.Biomes;
import net.minecraft.init.Blocks;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraft.world.biome.Biome;
import net.minecraft.world.biome.BiomeHills;
import net.minecraft.world.chunk.ChunkPrimer;
import net.minecraft.world.gen.feature.WorldGenIceSpike;
import net.minecraft.world.gen.feature.WorldGenLakes;
import net.minecraftforge.common.BiomeManager.BiomeType;
	public class BiomeVolcano extends BiomeHills{
    private WorldGenLakes LAKES = new WorldGenLakes(Blocks.LAVA);
    
    public BiomeVolcano() {
        super(BiomeHills.Type.NORMAL, new BiomeProperties("Volcano").setTemperature(10.0F).setBaseHeight(1.0F).setHeightVariation(0.1F));
        this.topBlock = Blocks.COAL_BLOCK.getDefaultState();
        this.fillerBlock = MWBlocks.LAVA_ROCK.getDefaultState();
        this.spawnableCreatureList.clear();
        this.spawnableMonsterList.add(new Biome.SpawnListEntry(EntityMagmaCube.class, 10, 1, 4));
    }
    
    @Override
    public int getSkyColorByTemp(float currentTemperature) {
        return 0xFF0000;
    }
    
    @Override
    public void decorate(World worldIn, Random rand, BlockPos pos) {
        super.decorate(worldIn, rand, pos);
        
        if(net.minecraftforge.event.terraingen.TerrainGen.decorate(worldIn, rand, pos, net.minecraftforge.event.terraingen.DecorateBiomeEvent.Decorate.EventType.LAKE_WATER))
        if (rand.nextInt(5) == 0)
        {
            int i = rand.nextInt(16) + 8;
            int j = rand.nextInt(16) + 8;
            BlockPos blockpos = worldIn.getHeight(pos.add(i, 0, j)).up();
            LAKES.generate(worldIn, rand, blockpos);
        }
        if (rand.nextInt(2) == 0)
        {
            int i = rand.nextInt(16) + 8;
            int j = rand.nextInt(16) + 8;
            BlockPos blockpos = worldIn.getHeight(pos.add(i, 0, j)).up();
            new WorldGenVolcano().generate(worldIn, rand, blockpos);
        }
    }
    
    public void genTerrainBlocks(World worldIn, Random rand, ChunkPrimer chunkPrimerIn, int x, int z, double noiseVal)
    {
        this.generateBiomeTerrain(worldIn, rand, chunkPrimerIn, x, z, noiseVal);
    }
}

And this is how i register it

public static Biome VOLCANO;
VOLCANO = new BiomeVolcano();
VOLCANO.setRegistryName("volcano"); //In the registration event
event.getRegistry().register(VOLCANO); //In the registration event
BiomeManager.addBiome(BiomeType.DESERT, new BiomeManager.BiomeEntry(VOLCANO, 5));