diff --git a/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/bop/BOPBiomeManagerMixin.java b/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/bop/BOPBiomeManagerMixin.java
index 3e22e43..8ef816b 100644
--- a/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/bop/BOPBiomeManagerMixin.java
+++ b/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/bop/BOPBiomeManagerMixin.java
@@ -10,6 +10,13 @@ import org.spongepowered.asm.mixin.injection.ModifyConstant;
 @Mixin(value = BOPBiomeManager.class,
        remap = false)
 public abstract class BOPBiomeManagerMixin {
+    @ModifyConstant(method = "<clinit>",
+                    constant = @Constant(intValue = 40),
+                    require = 1)
+    private static int shiftBiomeIDsUp(int id) {
+        return id + 14000;
+    }
+
     @ModifyConstant(method = "getNextFreeBiomeId",
                     constant = @Constant(intValue = VanillaConstants.biomeIDCount),
                     require = 1)
diff --git a/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/erebus/ModBiomesMixin.java b/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/erebus/ModBiomesMixin.java
index 44c979f..12c9dc0 100644
--- a/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/erebus/ModBiomesMixin.java
+++ b/src/main/java/com/falsepattern/endlessids/mixin/mixins/common/erebus/ModBiomesMixin.java
@@ -47,6 +47,20 @@ public abstract class ModBiomesMixin {
     @Shadow
     public static int savannahSubSteppeID;
 
+    @ModifyConstant(method = "<clinit>",
+                    constant = {@Constant(intValue = 100),
+                                @Constant(intValue = 101),
+                                @Constant(intValue = 102),
+                                @Constant(intValue = 103),
+                                @Constant(intValue = 104),
+                                @Constant(intValue = 105),
+                                @Constant(intValue = 106),
+                                @Constant(intValue = 107)},
+                    require = 8)
+    private static int shiftBiomeIDsUp(int id) {
+        return id + 13000;
+    }
+
     @ModifyConstant(method = "init",
                     constant = @Constant(intValue = 128),
                     require = 1)