diff --git a/src/main/java/biomesoplenty/common/world/layer/GenLayerBiomeBOP.java b/src/main/java/biomesoplenty/common/world/layer/GenLayerBiomeBOP.java
index f164a2c11..0ef485ba1 100644
--- a/src/main/java/biomesoplenty/common/world/layer/GenLayerBiomeBOP.java
+++ b/src/main/java/biomesoplenty/common/world/layer/GenLayerBiomeBOP.java
@@ -110,6 +110,10 @@ public class GenLayerBiomeBOP extends GenLayerBiome
                 {
                     outputBiomeIDs[j1 + i1 * width] = getBiomeIdFromList(3);
                 }
+                else if (BOPConfigurationBiomeGen.mushroomIslandGen)
+                {
+                	outputBiomeIDs[j1 + i1 * width] = BiomeGenBase.mushroomIsland.biomeID;
+                }
                 else
                 {
                 	outputBiomeIDs[j1 + i1 * width] = getBiomeIdFromMixedList();