diff --git a/src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java b/src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java
index a28628b46..d143cea84 100644
--- a/src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java
+++ b/src/main/java/com/volmit/iris/core/pregenerator/IrisPregenerator.java
@@ -140,6 +140,7 @@ public class IrisPregenerator {
         generator.close();
         ticker.interrupt();
         listener.onClose();
+        getMantle().trim(0);
     }
 
     private void visitRegion(int x, int z, boolean regions) {